Dictionary.com

counteract

[ koun-ter-akt ]
/ ˌkaʊn tərˈækt /
Save This Word!
See synonyms for: counteract / counteracting on Thesaurus.com

verb (used with object)
to act in opposition to; frustrate by contrary action.
QUIZ
CUDDLE UP! A COZY QUIZ ON FALL WORDS HAS ARRIVED
If autumn is your ideal season, spice up your repertoire of "fall" vocabulary with this quiz on some warm and vivid descriptive words for the season.
Question 1 of 10
Which of the following words means “to make a crackling sound; crackle”?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of counteract

First recorded in 1670–80; counter- + act

OTHER WORDS FROM counteract

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use counteract in a sentence

British Dictionary definitions for counteract

counteract
/ (ˌkaʊntərˈækt) /

verb
(tr) to oppose, neutralize, or mitigate the effects of by contrary action; check

Derived forms of counteract

counteraction, nouncounteractive, adjectivecounteractively, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
FEEDBACK