French · Pronunciation Guide
day-zo-LAY — and that middle "s" is a "z", because it sits between two vowels.
Three even syllables with the lift on the final one: dé-zo-LÉ. Every syllable gets a clear, full vowel — none of them reduce to "uh" the way an English three-syllable word would.
Listen: désolé
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Désolé, je suis en retard.
Sorry, I'm late.
Listen: Désolé, je suis en retard.
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"Désolé, je suis en retard" contains the nasal phrase "en retard", where "en" is the nasal vowel /ɑ̃/ and "retard" ends in a silent "d". The whole thing is /ɑ̃ ʁə.taʁ/. Note also that the apology is masculine here; a woman writes "désolée" but says exactly the same three syllables.
The "s" is the trap. English speakers see "désolé" and reach for "desolate", which has a hissing "s", so they say "day-so-lay". French has an ironclad rule in the other direction: one "s" between vowels is voiced to "z". You want "day-zo-LAY". The second issue is the final vowel — the English habit is to glide from "eh" toward "ee" at the end of "-ay", which makes the word sound sung. Cut it off clean.