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counteract (v.)

"act in opposition, hinder or defeat by contrary action," 1670s, from counter- + act (v.). Related: Counteracted; counteracting; counteractive; counteraction.

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Definitions of counteract from WordNet

counteract (v.)
act in opposition to;
Synonyms: antagonize / antagonise
counteract (v.)
oppose or check by a counteraction;
Synonyms: countercheck
counteract (v.)
oppose and mitigate the effects of by contrary actions;
This will counteract the foolish actions of my colleagues
counteract (v.)
destroy property or hinder normal operations;
Synonyms: sabotage / undermine / countermine / subvert / weaken
From wordnet.princeton.edu