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counteract

[koun-ter-akt]
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verb (used with object)
  1. to act in opposition to; frustrate by contrary action.

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

Synonyms

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neutralize, counterbalance, contravene, thwart.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for counteractive

Historical Examples

  • No counteractive effect to this prepossession was to be found in contemporary opinion in Europe.

    Sea Power in its Relations to the War of 1812

    Alfred Thayer Mahan

  • But, along with so many incentives to excess, were there no counteractive agencies at work?

  • The counteractive of a false spiritualism is found in the incarnate life of the Son of God.


British Dictionary definitions for counteractive

counteract

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

counteract

v.

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

Online Etymology Dictionary, © 2010 Douglas Harper