weaken vs counteract

weaken and counteract both are verbs.

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

As verbs, weaken and counteract are synonyms defined as:

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

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