contravene vs negate

contravene and negate both are verbs.

Word	Noun	Adjective	Verb	Adverb
contravene	No	No	Yes	No
negate	No	No	Yes	No

As verbs, contravene and negate are synonyms defined as:

Other synonyms of contravene include contradict.

contravene (verb)	negate (verb)
deny the truth of	make ineffective by counterbalancing the effect of
go against, as of rules and laws	prove negative; show to be false
	deny the truth of
	be in contradiction with