emasculate

Short definition from Wiktionary

Verb

1. 1
   To deprive of virile or procreative power; to castrate, to geld.
2. 2
   To deprive of virile or procreative power; to castrate, to geld: To remove the entire male genitalia (the testicles, scrotum, and penis) of (a person or animal).
3. 3
   To deprive of masculine vigor or spirit; to weaken; to render effeminate; to vitiate by unmanly softness.
4. 4
   Of a flower: to deprive of the anthers.

Adjective

1. 1
   Deprived of virility or vigor; unmanned, weak.