\Un*man"\, v. t. [1st pref. un- + man.] 1. To deprive of the distinctive qualities of a human being, as reason, or the like. [R.] --South. 2. To emasculate; to deprive of virility. 3. To deprive of the courage and fortitude of a man; to break or subdue the manly spirit in; to cause to despond; to dishearten; to make womanish. Let's not unman each other. --Byron. 4. To deprive of men; as, to unman a ship.