counteract vs weaken

counteract and weaken both are verbs.

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

As verbs, counteract and weaken are synonyms defined as:

Other synonyms of counteract include countermine, sabotage, subvert, undermine.

counteract (verb)	weaken (verb)
act in opposition to	become weaker
destroy property or hinder normal operations	lessen the strength of
oppose or check by a counteraction	reduce the level or intensity or size or scope of
oppose and mitigate the effects of by contrary actions	lessen in force or effect
	destroy property or hinder normal operations