Also means
mad
Usage Note
Fou is the masculine form; the feminine is folle. It can range from playful ('crazy in a fun way') to clinical. The phrase c'est fou is extremely common in informal speech to mean 'that's incredible' or 'that's insane.' Un fou as a noun also means 'a bishop' in chess.
Examples
"C'est complètement fou."
Natural Translation
That is completely crazy.

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