Learner's definition of UNFIT
1 : not proper, suitable, or acceptable — often + for — often followed by to + verb 2 : not having the necessary qualities, skills, mental health, etc., to do something — often + for
— sometimes followed by to + verb
He's clearly unfit for the position.
He's unfit for army service.
The defendant was declared unfit for trial.
3 : not physically healthy : not in good physical condition