French · Pronunciation Guide
bluh, with the lips rounded forward — the same vowel as "deux". One syllable, no "oo".
One syllable, so the word takes whatever weight the phrase gives it. In "bleu clair" or "bleu foncé" the peak moves to the second word, leaving "bleu" short and quick.
Listen: bleu
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Le ciel est bleu.
The sky is blue.
Listen: Le ciel est bleu.
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"Le ciel est bleu" ends on the colour, giving that /ø/ vowel its full value at the phrase peak. "Ciel" is one syllable, /sjɛl/, with the "i" acting as a "y" glide rather than a separate vowel, and "est" is again just /ɛ/. The whole sentence is only four syllables: luh-SYEL-eh-BLUH.
The English word "blue" is so close in spelling and meaning that it gets substituted wholesale, giving "bloo". The French vowel is completely different: /u/ (as in "vous") is made at the back of the mouth, while /ø/ has the tongue forward and high. Learners who avoid "bloo" often overshoot into a flat unrounded "bluh", which loses the characteristic sound. Round the lips deliberately — you should be able to feel them pushing forward.