f/f/
Lift your bottom lip to touch the very bottom of your top front teeth. Blow air through this contact point without voicing.
How to pronounce flexible in American English
FLEHK·suh·buhl
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Americans pronounce flexible as FLEHK-suh-buhl (/ˈflɛksəbəl/). The L in "flexible" 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, and it's why Americans sound more relaxed than the textbook. It comes out as FLEHK·suh·buhl. Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "I really appreciate you being so flexible with the timing".
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Sound by sound
Every sound in "flexible".
3 syllables, 9 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
l/l/
Place the tip of your tongue against the alveolar ridge just behind your top front teeth, the same contact point as /t/, /d/, and /n/. The difference is what happens to the air: for /l/, you let it flow continuously around the <em>sides</em> of the tongue (that's why /l/ is called a lateral). Turn your voice on the whole time. Lips stay relaxed, no rounding or flaring. For the Dark L variant at the end of a syllable, also pull the back of the tongue up and back toward the soft palate.
eh/ɛ/
Drop your jaw moderately. Touch the tongue tip behind the bottom front teeth and lift the mid-front part slightly toward the roof.
k/k/
Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.
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.
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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 "flexible" 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.
flexible→FLEHK·suh·buhl
02
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch FLEHK — keep everything else short and quick.
flehk·SUH·BUHL→FLEHK·suh·buhl
03
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.
FLEHK·SUH·buhl→FLEHK·suh·buhl
Questions
Questions people ask about this.
How is "flexible" stressed in American English?
Stress falls on the first syllable — say "FLEHK" with a longer, fuller vowel and keep every other syllable short and quick. The respell "FLEHK-suh-buhl" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why does the second syllable in "flexible" 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 "FLEHK-suh-buhl" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "flexible" 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 "FLEHK-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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