Usage Note
Fiévreux means having or causing fever (un enfant fiévreux), but also describes intense agitation or excitement: une activité fiévreuse (feverish activity). The feminine form is fiévreuse. It is close to fébrile, which leans more toward the figurative sense in formal writing.
Examples
"Il est resté au lit, fiévreux toute la nuit."
Natural Translation
He stayed in bed, feverish all night.

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