Source : Webster's Revised Unabridged Dictionary (1913)

Unsex \Un*sex"\, v. t. [imp. & p. p. {Unsexed}; p. pr. & vb. n.
   {Unsexing}.] [1st pref. un- + sex.]
   To deprive of sex, or of qualities becoming to one's sex;
   esp., to make unfeminine in character, manners, duties, or
   the like; as, to unsex a woman.

Source : WordNet®

unsex
     v 1: deprive of sex or sexual powers
     2: remove the qualities typical of one's sex; "She unsexed
        herself"
     3: make infertile; "in some countries, people with genetically
        transmissible disbilites are sterilized" [syn: {sterilize},
         {sterilise}, {desex}, {desexualize}, {desexualise}, {fix}]