What causes poor pronunciation? In most cases it is not laziness, and it is not a lack of talent. Poor pronunciation usually comes from your first language, from English spelling, from word stress you were never taught, and from years of speaking without anyone correcting you. The good news is that every one of these causes can be worked on, because pronunciation is a physical skill, not a gift you either have or do not have.

This article looks at the seven causes that sit behind most unclear English, with examples for Urdu and Hindi speakers, and finishes with a fix for each one. If you can hear your own mistakes, you can change them. If you cannot hear them yet, that is itself one of the causes, and it is fixable too.

1. Your first language is doing the talking

The single biggest cause of poor pronunciation is language transfer, which linguists also call interference. Your first language gives you a set of sounds, a rhythm and a stress pattern, and when you speak English your brain reaches for those familiar habits first. Research on native language influence describes this plainly: features of a learner’s first language affect how English sounds are produced, from individual sounds to stress, rhythm and intonation, and the goal of working on it is clear and intelligible communication rather than removing your accent altogether.

This is not a flaw in your learning. It is how the brain works. You learned your first language by copying the sounds around you as a child, and those sound patterns became automatic. English has to compete with that automation every time you open your mouth. The effect is strongest with sounds and patterns that your first language does not use at all, which is why the same mistakes appear again and again in speakers from the same language background.

For Urdu and Hindi speakers, the transfer is easy to hear. Both languages give each syllable roughly equal weight, so English words come out flat, with every syllable given the same time and force. English does the opposite: it stretches stressed syllables and squeezes the rest, which is why learners who stress every syllable sound robotic even when every sound is right.

2. English has sounds your language does not

Some English sounds simply do not exist in Urdu or Hindi, and the brain handles a missing sound by swapping in the nearest sound it does know. The two “th” sounds are the classic example. English has the voiceless /θ/ in think and the voiced /ð/ in this, and neither sound exists in Urdu or Hindi. The usual substitutions are /t/ and /d/, so think becomes tink and this becomes dis. The same substitution pattern is documented across many learner groups: where a sound is absent from the first language, speakers replace it with the closest sound they have.

The /v/ and /w/ pair causes the same trouble. IELTS preparation guidance from IDP lists /v/ and /w/ among the consonants learners most often confuse, with vet and wet as the example pair. Many Urdu and Hindi speakers merge the two, so very comes out as wery and west as vest. The listener can usually guess the meaning from context, but in a test or a job interview the confusion costs clarity, and in words such as vine and wine it can change the meaning entirely.

Consonant clusters cause a third problem. English happily starts words with two or three consonants, as in school, stream and splash. Hindi and Urdu do not allow those clusters at the start of a word, so speakers often add a vowel to break them up: school becomes iskul and stream becomes istreem. This pattern is documented in work on mother tongue influence, and it is a direct result of the syllable rules of the first language, not of carelessness.

3. English spelling lies to you

English spelling is a poor guide to pronunciation, and learners who trust it get misled daily. The letter combination “ough” is pronounced differently in though, through, thought and tough, four words that look like cousins and sound like strangers. Silent letters add to the confusion: the k in know, the b in doubt, the l in walk and the t in listen are all written and never said.

The damage is worse than a few wrong words. When you first meet a word in print and guess its pronunciation from its spelling, that guess can stick. This is sometimes called spelling pronunciation, and it explains why learners who read a lot but speak little often pronounce familiar words in ways that surprise their teachers. The spelling becomes the memory, and the real sound never gets a chance to replace it.

The fix is a habit, not a talent: never learn a new word without hearing it. A dictionary with audio, such as the Cambridge Dictionary, takes five seconds to check. Five seconds of listening beats five years of saying a word wrong.

4. Word stress and the missing schwa

Even when every sound is right, putting the stress on the wrong syllable can make a word hard to recognise. Record and record are spelled the same, but the stress tells the listener whether you mean the noun or the verb. IELTS guidance warns that stressing the wrong syllable can leave the listener unsure what you mean, or thinking you mean a different word. This is a suprasegmental problem, meaning it sits above the level of individual sounds, and it is one of the most common causes of poor pronunciation in otherwise fluent speakers.

The deeper cause is the schwa, the most common vowel sound in English. The British Council’s teaching guidance calls it the most common English sound and explains the logic behind it: English is a stress-timed language, so the important words in a sentence, nouns, main verbs, adjectives and adverbs, are stressed, while grammar words such as articles, prepositions and pronouns are not stressed and are reduced, often to a schwa. That is why about, banana, support and sister all contain a small, relaxed “uh” sound in their unstressed syllables, whatever vowel is written there.

Urdu and Hindi speakers often miss the schwa because their languages pronounce vowels at full value. The result is that every vowel is said clearly and every syllable takes the same time, which flattens the rhythm of English and makes the speaker harder to follow. Learning the schwa is the fastest single upgrade most learners can make, because it changes the rhythm of everything you say rather than one word at a time.

5. You learned English through reading, not listening

In Pakistan and India, many learners meet English mainly in textbooks and exam papers. Reading builds vocabulary and grammar, but it does not train the mouth or the ear. Pronunciation is a physical skill: the tongue, lips and jaw have to learn new positions, and the ear has to learn to hear differences it was never trained to notice. Neither of those things happens on a printed page.

This is why a learner can score highly in written English and still be hard to understand when speaking. The knowledge is there, but the muscle memory is not. The same gap appears in listening: if you have never heard connected speech, where words join together and sounds change at word boundaries, natural English sounds fast and blurred, and your own speech comes out word by word, with a pause between every item.

IELTS preparation guidance makes the same point from the test side: learners who speak word by word instead of grouping words into phrases lose the natural flow of speech, and pronunciation is judged on stress, intonation, rhythm and chunking, not only on individual sounds. Reading alone cannot teach any of those four.

6. Nobody corrected you, so the error fossilised

The sixth cause is the quietest and the most stubborn. When a pronunciation error is repeated for years without correction, it can become fixed in the speaker’s habits, a process linguists call fossilisation. The term comes from Larry Selinker, who proposed it in 1972 to describe errors that persist even after years of instruction and exposure. Later research on fossilised pronunciation errors lists the same causes again and again: differences between the sound systems of the two languages, lack of exposure, lack of feedback, age, and motivation.

Fossilisation is not a life sentence. Targeted instruction has been shown to reduce pronunciation errors, while learners who receive no targeted instruction show no improvement over the same period. The problem is not that the error cannot change, but that it will not change on its own. Uncorrected practice is not neutral: it rehearses the mistake and makes it more automatic each time.

This is also why many learners say their pronunciation is “stuck”. It is not stuck because they are incapable of change. It is stuck because the error was never interrupted. The moment someone points out that you say tink for think, and you practise the real sound for ten minutes a day, the pattern starts to move.

7. You started late, or you rarely speak

Age matters, but not in the way learners often fear. Research summarised in the pronunciation literature finds that people who begin a second language later in life tend to have stronger foreign accents, and that simply spending more years in an English speaking environment does not by itself remove an accent. What matters is not the number of years but what happens in them: how much you speak, how much feedback you get, and how much attention you pay to how you sound.

Many learners also avoid speaking because they are afraid of sounding wrong, and that avoidance is itself a cause of poor pronunciation. Pronunciation improves through speaking, and every avoided conversation is a missed repetition. Confidence is not a personality trait here; it is a by-product of practice. Learners who speak a little every day improve faster than learners who wait until they feel ready, because readiness never arrives without the practice that creates it.

The honest version of the age question is therefore encouraging rather than discouraging. An adult learner will probably keep some trace of their first language, and that is normal and fine. But an adult learner can absolutely become clear, confident and easy to understand, because clarity is a learnable skill and it responds to the same kind of deliberate practice as any other.

How to fix each cause

Each cause above has a matching fix. Work on the one that matches your own speech, not all seven at once.

Shadowing deserves a special mention because it attacks several causes at once: it trains the ear, the mouth and the rhythm together. Our guide to the technique explains the method step by step.

What poor pronunciation is not

Poor pronunciation is not the same as having an accent. An accent is the trace of your first language in your English, and every speaker has one, including native speakers. IELTS examiners know that candidates will have an accent from their native language, and they score pronunciation on how clear and easy to follow the speech is, not on how native it sounds. Pronunciation is worth a quarter of the IELTS Speaking score, which is exactly why it is worth working on, but the target is intelligibility, not imitation.

Poor pronunciation is also not a sign of low intelligence or low English ability. Many learners with excellent grammar and vocabulary are hard to understand, and many learners with simple grammar are perfectly clear. Pronunciation is a separate skill with separate causes, and it needs separate practice. That is the whole point of naming the causes: once you know which one is behind your own speech, the fix is obvious, and the work is small.

Frequently asked questions

What causes poor pronunciation in English learners?

What causes poor pronunciation is usually a mix of first language interference, English sounds that do not exist in the learner’s language, misleading spelling, wrong word stress, learning through reading instead of listening, and years of speaking without correction. Age and low speaking practice add to the effect. Each cause has a specific fix, and most learners only need to work on two or three of them.

Is poor pronunciation caused by your mother tongue?

Yes, in large part. Your mother tongue supplies the sounds, rhythm and stress pattern your brain reaches for when you speak English, and where the two languages differ, the first language wins by default. Hindi and Urdu speakers, for example, often replace the English “th” sounds with /t/ and /d/ and give every syllable equal weight. The influence is natural and it can be reduced with targeted practice, but it is not something to be ashamed of.

Can poor pronunciation be fixed as an adult?

Yes. Adults can become clear and easy to understand, even if a trace of their accent remains. Research on fossilised pronunciation shows that targeted instruction reduces errors, while learners who receive no instruction do not improve. The practical method is to record yourself, identify one error, and drill it daily with dictionary audio and shadowing until the new habit replaces the old one.

Does poor pronunciation affect your IELTS Speaking score?

Yes. Pronunciation is one of the four marking criteria for IELTS Speaking, so it accounts for a quarter of the score, and examiners judge stress, intonation, rhythm and chunking alongside individual sounds. An accent itself is not penalised, but speech that is hard to follow will score lower. Working on word stress and the schwa is the fastest way to lift this part of the score.

Why do I pronounce words correctly alone but not in conversation?

Because speaking alone lets you focus on one word at a time, while conversation demands sounds, stress, rhythm and meaning all at once, and under pressure your brain falls back on first language habits. The gap closes with shadowing and with speaking practice in short, realistic bursts, which train the new habits until they survive real conversation.

Related reading

• What Are 5 Rules of Pronunciation?
• Shadowing Technique to Improve English Speaking
• How to Get 9.0 in IELTS Speaking
• Common English Mistakes in India
• Daily Use English Sentences with Urdu Meaning

Sources

• IDP IELTS, “How to improve IELTS Speaking: Pronunciation tips and mistakes to avoid”, ielts.idp.com
• British Council TeachingEnglish, “Teaching the schwa”, teachingenglish.org.uk
• Remei, L., “Mother Tongue Influence on English Pronunciation: Solutions from Linguistics”, dottalks.in
• “Revisiting Fossilised Pronunciation Errors: An Exploratory Study with Turkish EFL Learners”, International Journal of Language Education and Applied Linguistics, 2024, journal.ump.edu.my
• “The Influence of Native Language on English Pronunciation”, European Science International Conference, esiconf.org