k/k/
Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.
How to pronounce complex in American English
KAHM·plehks
Start here
Americans pronounce complex as KAHM-plehks (/ˈkɑmplɛks/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "He tried to explain the complex problem" or "The spider spun a complex web to catch insects" — more examples below.
Now you try.
Record yourself saying "complex" and play it back. The mic stays on your device — nothing's uploaded.
Sound by sound
Every sound in "complex".
2 syllables, 8 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
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.
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.
In real conversation
Hear "complex" in the wild.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
"He tried to explain the complex problem."
hee TRAHYD tuh uhk·SPLAYN dhuh KAHM·plehks PRAH·bluhm
"I enjoy solving complex crossword puzzles to keep my mind sharp."
ahy uhn·JOY SAHL·vuhng KAHM·plehks KRAHS·wurd PUH·zuhlz tuh KEEP mahy MAHYND SHARP
"She explains complex medical terms in simple language."
shee uhk·SPLAYNZ KAHM·plehks MEH·duh·kuhl TURMZ uhn SIHM·puhl LANG·gwuhj
"She used mnemonic devices to remember complex sequences of information."
shee YOOZD nuh·MAH·nuhk duh·VAHY·suhz tuh ruh·MEHM·ber KAHM·plehks SEE·kwuhn·suhz uhv ihn·fer·MAY·shuhn
"The essay prompt asked students to analyze a complex issue."
dhee EH·say PRAHMPT ASKT STOO·duhnts tuh A·nuh·lahyz uh KAHM·plehks IH·shoo
"The film explores complex themes of identity and belonging."
dhuh FIHLM uhk·SPLORZ KAHM·plehks THEEMZ uhv ahy·DEHN·tuh·tee and buh·LAHNG·uhng
Find another
Looking for a different word or sentence?
Search the entire library
/
Press / anywhere to focus the search box.
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 KAHM — keep everything else short and quick.
kahm·PLEHKS→KAHM·plehks
Questions
Questions people ask about this.
How is "complex" stressed in American English?
Stress falls on the first syllable — say "KAHM" with a longer, fuller vowel and keep every other syllable short and quick. The respell "KAHM-plehks" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Is the American pronunciation of "complex" 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 "KAHM-plehks" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
Stop reading about "complex". Start saying it.
SayWaader is the AI pronunciation coach for American English. Practice 5 minutes a day. Get a 5-axes accent assessment. Sound like you live here.