emasculate vs weaken

emasculate is an adjective but weaken is not an adjective.

Word	Noun	Adjective	Verb	Adverb
emasculate	No	Yes	Yes	No
weaken	No	No	Yes	No

As verbs, weaken is a hypernym of emasculate; that is, weaken is a word with a broader meaning than emasculate:

emasculate (adjective)	weaken (adjective)
having unsuitable feminine qualities

emasculate (verb)	weaken (verb)
remove the testicles of a male animal	become weaker
deprive of strength or vigor	lessen the strength of
	reduce the level or intensity or size or scope of
	lessen in force or effect
	destroy property or hinder normal operations