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Definitions

counteract

[koun-ter-akt] / ˌkaʊn tərˈækt /
VERB
do opposing action
Synonyms
STRONGEST
cancel out correct counterbalance halt negate neutralize offset prevent rectify redress resist thwart
STRONG
annul buck cancel check contravene countercheck countervail cross defeat fix foil frustrate hinder invalidate negative oppose remediate right
WEAK
counterwork go against
Antonyms
STRONGEST
aid allow assist forward help worsen
STRONG
abet approve break encourage facilitate permit support uphold validate

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"Physical activity, such as resistance training, is important to counteract potential negative effects on muscle strength," he added.

From BBC • Mar. 31, 2026

None of it did much to counteract the sense that life had become too expensive.

From Slate • Mar. 25, 2026

Announcing its approval, the FCC said the deal would help "counteract the growing imbalance of power" between local broadcast TV stations and the large media firms, including Fox, Disney and Paramount, that dominate programming.

From BBC • Mar. 20, 2026

In the new study, the team explored whether GLP-1 drugs could counteract this process and reopen the tiny blood vessels that become blocked.

From Science Daily • Mar. 4, 2026

“Relax, I’m just trying to counteract the Doritos.”

From "Far from the Tree" by Robin Benway

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.