French · Pronunciation Guide
kü-RYUH — the tight French "u" first, then a throat "r", a "y" glide, and a rounded vowel.
cu-RIEUX, weight on the second syllable. Two beats, not three — the "-rieux" ending is a single glide-plus-vowel unit.
Listen: curieux
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Les enfants sont curieux.
Children are curious.
Listen: Les enfants sont curieux.
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"Les enfants sont curieux" carries an obligatory liaison at the start: "les enfants" is /le.z‿ɑ̃.fɑ̃/. The plural "x" on "curieux" is silent and the word is invariable in the masculine plural, so singular and plural sound identical. "Sont" ends in a silent "t" with no liaison here.
The English "curious" supplies a "kyoo" at the front and three syllables. French has a pure front-rounded /y/ with no glide before it, and two beats. Learners also split "-rieux" into "ree-UH". And note the meaning is narrower than English — "curieux" can also mean odd or strange, so "c'est curieux" often means "that's peculiar".