uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
How to pronounce impossible in American English
uhm·PAH·suh·buhl
Start here
Americans pronounce impossible as uhm-PAH-suh-buhl (/əmˈpɑsəbəl/). The L in "impossible" is a dark L — the back of the tongue rises toward the soft palate, adding a small "uh" quality before the L. This is called the Dark L vs Light L, a hallmark of natural-sounding American speech. It comes out as uhm·PAH·suh·buhl. Stress falls on the second syllable — keep everything else short and quick. You'll hear it in sentences like "The heatwave made it almost impossible to go outside comfortably" or "Quantum computing promises to solve previously impossible problems" — more examples below.
Now you try.
Record yourself saying "impossible" and play it back. The mic stays on your device — nothing's uploaded.
Sound by sound
Every sound in "impossible".
4 syllables, 9 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
m/m/
Press your lips together. Air flows through your nose. Vocal cords vibrate.
p/p/
Press your lips together to stop the air, then release. No vocal cord vibration.
ah/ɑ/
Relax your lips and drop your jaw significantly. The tongue tip lightly touches behind the bottom front teeth and the back part of the tongue presses down a little to create more dark space in the back 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.
b/b/
Press your lips together, add vocal cord vibration, then release.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
l/l/
DarkKeep the tongue tip down and pull the back of the tongue up toward the throat. The 'dark' sound comes from the back.
In real conversation
Hear "impossible" in the wild.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
"Quantum computing promises to solve previously impossible problems."
KWAHN·tuhm kuhm·PYOO·tuhng PRAH·muh·suhz tuh SAHLV PREE·vee·uh·slee uhm·PAH·suh·buhl PRAH·bluhmz
"The heatwave made it almost impossible to go outside comfortably."
dhuh HEET·wayv MAYD iht AHL·mohst uhm·PAH·suh·buhl tuh GOH OWT·sahyd KUHM·fer·tuh·blee
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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
Treating every L the same.
The L in "impossible" is a dark L — the back of the tongue rises toward the soft palate, adding a small "uh" quality before the L. Dark L adds a small schwa-like "uh" before the L. The back of the tongue lifts toward the soft palate.
impossible→uhm·PAH·suh·buhl
02
Stressing the wrong syllable.
Stress falls on the second syllable, not the others. Stretch PAH — keep everything else short and quick.
UHM·pah·SUH·BUHL→uhm·PAH·suh·buhl
03
Pronouncing the first 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.
UHM·PAH·suh·buhl→uhm·PAH·suh·buhl
Questions
Questions people ask about this.
How is "impossible" stressed in American English?
Stress falls on the second syllable — say "PAH" with a longer, fuller vowel and keep every other syllable short and quick. The respell "uhm-PAH-suh-buhl" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why does the first syllable in "impossible" 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 "uhm-PAH-suh-buhl" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "impossible" 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 "uhm-PAH-suh-buhl" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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