v. t. | 1. | To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; |
Verb | 1. | counteract - act in opposition to Synonyms: antagonise, antagonize |
2. | counteract - oppose or check by a counteraction Synonyms: countercheck | |
3. | counteract - oppose and mitigate the effects of by contrary actions; "This will counteract the foolish actions of my colleagues" | |
4. | counteract - destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war" |