counteract

Plural: counteracts

Verb

• act in opposition to
• oppose or check by a counteraction
• oppose and mitigate the effects of by contrary actions
  • "This will counteract the foolish actions of my colleagues"
• destroy property or hinder normal operations
• To have a contrary or opposing effect or force on someone or something.
• To deliberately act in opposition to, to thwart or frustrate.

Noun

• An action performed in opposition to another action.

Synonyms

antagonise, antagonize, counterbalance, countercheck, countermine, countervail, neutralize, sabotage, subvert, undermine, weaken, counteract, counterwork, offset, remedy

Antonyms

abet, assist, help, reinforce, support, sustain