undermine vs counteract

undermine and counteract both are verbs.

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

As verbs, undermine and counteract are synonyms defined as:

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

undermine (verb)	counteract (verb)
hollow out as if making a cave or opening	act in opposition to
destroy property or hinder normal operations	destroy property or hinder normal operations
	oppose or check by a counteraction
	oppose and mitigate the effects of by contrary actions