Unfit
Unfit , transitive verb
[1st pref. un- + fit.]
To make unsuitable or incompetent; to deprive of the strength, skill, or proper qualities for anything; to disable; to incapacitate; to disqualify; as, sickness unfits a man for labor; sin unfits us for the society of holy beings.
Unfit , adjective
[Prefix un- + fit.]
Not fit; unsuitable.