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unfit (adj.)

1540s, "not suitable" (in reference to things), from un- (1) "not" + fit (adj.). Related: Unfitness. In reference to persons or human qualities, attested from 1550s.

unfit (v.)

"to render unfit," 1610s, from unfit (adj.), or else from un- (2) "reverse of" + fit (v.). Related: Unfitted; unfitting.

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Definitions of unfit
1
unfit (adj.)
below the required standards for a purpose;
unfit for human consumption
an unfit parent
unfit (adj.)
not in good physical or mental condition; out of condition;
certified as unfit for army service
drunk and unfit for service
fat and very unfit
unfit (adj.)
physically unsound or diseased;
Synonyms: bad / unsound
2
unfit (v.)
make unfit or unsuitable;
Synonyms: disqualify / indispose
From wordnet.princeton.edu