English dictionary

counteract

/,k/AU/nt/@/r'/&/kt/

Definitions, examples, synonyms and antonyms from WordNet 3.0.

verb

act in opposition to

verb.social

Synonyms antagonise antagonize

Source: WordNet 3.0
oppose or check by a counteraction

verb.social

Synonyms countercheck

Source: WordNet 3.0
oppose and mitigate the effects of by contrary actions

verb.social

Examples
This will counteract the foolish actions of my colleagues.

Synonyms counterbalance countervail neutralize

Source: WordNet 3.0
destroy property or hinder normal operations

verb.social

Synonyms countermine sabotage subvert undermine weaken

Source: WordNet 3.0
To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; as, to <i>counteract</i> the effect of medicines; to <i>counteract</i> good advice.

verb

Source: webster1913