counteract vs antagonise

counteract and antagonise both are verbs.

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

As verbs, counteract and antagonise are synonyms defined as:

Other synonyms of counteract include antagonize.

counteract (verb)	antagonise (verb)
act in opposition to	provoke the hostility of
destroy property or hinder normal operations	act in opposition to
oppose or check by a counteraction
oppose and mitigate the effects of by contrary actions