Meaning

verb make unfit or unsuitable

adjective below the required standards for a purpose

adjective not in good physical or mental condition; out of condition

originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English fit English unfit From un- + fit.

Etymology from Wiktionary, CC BY-SA 3.0