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.
权威例句
1. Most of the wine was unfit for human consumption.
这些酒中大部分都不适于人类饮用。
2. Mr Abel's doctor has said he is unfit to travel.
埃布尔先生的医生说他不宜出行。
3. He had a third examination and was declared unfit for duty.
他接受了第三次检查,被告知不宜上班。
4. His lawyers are arguing that he is unfit to stand trial.
他的律师正在提出理由说明他不适合出庭受审。
5. He was found to be mentally unfit to stand trial.