Unfit, v. t.
Etymology: [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.
1 other Webster entry under this spelling
Unfit, a.
Not fit; unsuitable. -- Un*fit"ly, adv. -- Un*fit"ness, n.