k/k/
Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.
How to pronounce complexity in American English
kuhm·PLEHK·suh·tee
Start here
Americans pronounce complexity as kuhm-PLEHK-suh-tee (/kəmˈplɛksəɾi/). In "complexity", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. This is called the Flap T, a hallmark of natural-sounding American speech. It comes out as kuhm·PLEHK·suh·tee. Stress falls on the second syllable — keep everything else short and quick. You'll hear it in sentences like "I appreciate the complexity of the musical arrangement" or "The trial lasted for three weeks due to the complexity" — more examples below.
Now you try.
Record yourself saying "complexity" and play it back. The mic stays on your device — nothing's uploaded.
Sound by sound
Every sound in "complexity".
4 syllables, 11 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
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.
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.
t/t/
FlapQuickly bounce the front of your tongue against the roof of your mouth. Don't stop the airflow — just a quick tap.
ee/i/
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.
In real conversation
Hear "complexity" in the wild.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
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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
Saying a hard "T" in the middle.
In "complexity", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. /t/ or /d/ becomes a quick tap [ɾ] — sounds like a soft D. The tongue briefly taps the ridge behind the upper teeth.
kuhm-PLEHK-suh-tee→kuhm·PLEHK·suh·tee
02
Stressing the wrong syllable.
Stress falls on the second syllable, not the others. Stretch PLEHK — keep everything else short and quick.
KUHM·plehk·SUH·TEE→kuhm·PLEHK·suh·tee
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.
KUHM·PLEHK·suh·tee→kuhm·PLEHK·suh·tee
Questions
Questions people ask about this.
How is "complexity" stressed in American English?
Stress falls on the second syllable — say "PLEHK" with a longer, fuller vowel and keep every other syllable short and quick. The respell "kuhm-PLEHK-suh-tee" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why doesn't the T sound like a T in "complexity"?
In American English, when /t/ sits between two vowels with the second one unstressed, it turns into a quick D-like flap. So "complexity" sounds closer to "kuhm-PLEHK-suh-tee" than to a crisp-T pronunciation. This is the flap-T rule, one of the most distinctive sounds of casual American speech.
Why does the first syllable in "complexity" 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 "kuhm-PLEHK-suh-tee" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "complexity" 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 "kuhm-PLEHK-suh-tee" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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