th/θ/
Place the very tip of your tongue slightly between your teeth. Blow air gently around it without voicing.
How to pronounce thesis in American English
THEE·suhs
Start here
Americans pronounce thesis as THEE-suhs (/ˈθisəs/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "She revised her thesis based on the professor's suggestions" or "I am working on my thesis proposal for the graduate committee" — more examples below.
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Sound by sound
Every sound in "thesis".
2 syllables, 5 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
ee/i/
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
In real conversation
Hear "thesis" in the wild.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
"I am working on my thesis proposal for the graduate committee."
ahy uhm WUR·kuhng ahn mahy THEE·suhs pruh·POH·zuhl fer dhuh GRA·joo·uht kuh·MIH·dee
"She revised her thesis based on the professor's suggestions."
shee ruh·VAHYZD her THEE·suhs BAYST ahn dhuh pruh·FEH·serz suh·JEHS·chuhnz
"The thesis statement should clearly present your main argument."
dhuh THEE·suhs STAYT·muhnt shuud KLEER·lee pruh·ZEHNT yer MAYN AR·gyuh·muhnt
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Watch out
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
01
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch THEE — keep everything else short and quick.
thee·SUHS→THEE·suhs
02
Pronouncing the unstressed syllable too fully.
Don't pronounce the first syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.
THEE·SUHS→THEE·suhs
Questions
Questions people ask about this.
How is "thesis" stressed in American English?
Stress falls on the first syllable — say "THEE" with a longer, fuller vowel and keep every other syllable short and quick. The respell "THEE-suhs" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why does the second syllable in "thesis" reduce to "uh"?
Unstressed syllables in American English collapse toward a schwa — a lazy, neutral "uh" sound. The full vowel is what textbooks teach, but in actual American speech every unstressed vowel reduces. The respell "THEE-suhs" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "thesis" different from British English?
American English uses different vowel shapes, a relaxed retroflex R, and connected-speech tricks like flap-T and glottal-stop T that British Received Pronunciation generally avoids. The respell "THEE-suhs" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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