counteract

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

Origin:
1670–80; counter- + act

counteractant, adjective
counteracter, counteractor, noun
counteractingly, adverb
counteraction, noun
counteractive, adjective
counteractively, adverb
noncounteractive, adjective
uncounteracted, adjective


neutralize, counterbalance, contravene, thwart.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
counteract (ˌkaʊntərˈækt)
 
vb
(tr) to oppose, neutralize, or mitigate the effects of by contrary action; check
 
counter'action
 
n
 
counter'active
 
adj
 
counter'actively
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

counteract
1670s, from counter- + act.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We need an action group that will work to counteract any and all purveyors of sloppy thinking in today's world.
Too often tofu is bland and boring, and its benefits cannot readily counteract
  this.
They are placed in interdisciplinary settings to counteract the narrowness of
  graduate training.
Monetary policy cannot counteract this, since all three are pegged to the euro.
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