• synonyms


See more synonyms for counteract on Thesaurus.com
verb (used with object)
  1. to act in opposition to; frustrate by contrary action.
Show More

Origin of counteract

First recorded in 1670–80; counter- + act
Related formscoun·ter·ac·tant, adjectivecoun·ter·act·er, coun·ter·ac·tor, nouncoun·ter·act·ing·ly, adverbcoun·ter·ac·tion, nouncoun·ter·ac·tive, adjectivecoun·ter·ac·tive·ly, adverbnon·coun·ter·ac·tive, adjectiveun·coun·ter·act·ed, adjective


See more synonyms for counteract on Thesaurus.com
neutralize, counterbalance, contravene, thwart.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for counteractant

Historical Examples

  • What had Clay to offer as a counteractant, as an equal inspiration to the pride of this lusty nation?

    Children of the Market Place

    Edgar Lee Masters

British Dictionary definitions for counteractant


  1. (tr) to oppose, neutralize, or mitigate the effects of by contrary action; check
Show More
Derived Formscounteraction, 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

Word Origin and History for counteractant



1670s, from counter- + act (v.). Related: Counteracted; counteracting.

Show More
Online Etymology Dictionary, © 2010 Douglas Harper