1. (adj)unfit below the required standards for a purpose "an unfit parent"; "unfit for human consumption"
2. (adj)unfit not in good physical or mental condition; out of condition "fat and very unfit"; "certified as unfit for army service"; "drunk and unfit for service"
3. (adj)bad, unfit, unsound physically unsound or diseased
"has a bad back"; "a bad heart"; "bad teeth"; "an unsound limb"; "unsound teeth"
4. (verb)disqualify, unfit, indispose make unfit or unsuitable
"Your income disqualifies you"