The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unsexed
    adj 1: deprived of sexual capacity or sexual attributes [syn:
           castrated, unsexed] [ant: uncastrated]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "unsexed":
   asexual, castrated, cold, debilitated, demasculinized, devitalized,
   effeminized, emasculate, emasculated, enervated, eunuchized,
   frigid, frustrated, gelded, impotent, lustless, marrowless,
   nerveless, neuter, neutral, pithless, sexless, sinewless, unmanned,
   unnerved, unsexual