No. 4,353 in French

fou

Crazy; mad.

In a sentence

Il est fou de joie aujourd'hui.
He is overjoyed today.
Here, 'fou' is used figuratively to express an extreme emotional state, 'overjoyed'.
Ce scientifique est fou, mais ses idées sont brillantes.
This scientist is mad, but his ideas are brilliant.
In this sentence, 'fou' describes someone as eccentric or having unconventional thinking.
Elle a trouvé un costume fou pour la fête.
She found a crazy outfit for the party.
Here, 'fou' is used to describe something unusual or unconventional, in this context an outfit.

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