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Definitions

weaken

[wee-kuhn] / ˈwi kən /
VERB
reduce the strength of
Synonyms
STRONGEST
abate decline decrease depress dilute diminish dwindle halt impair lessen lower reduce sap soften undermine wane
STRONG
adulterate crumble cut debase debilitate devitalize droop enervate exhaust fade fail faint flag impoverish invalidate languish limp lose minimize mitigate moderate relapse relax temper thin tire totter tremble vitiate wilt
WEAK
break up ease up give way lose spirit slow down thin out water down
Antonyms
STRONGEST
aid assist compliment develop encourage enlarge expand extend grow help increase praise prolong raise rise strengthen
STRONG
achieve activate aggravate agitate animate clean energize enhance excite free improve incite invigorate purify refresh succeed win
WEAK
build up

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.

It Kelleher stated the proposed rules would make UBS an international outlier and weaken it compared to rivals.

From The Wall Street Journal • Apr. 15, 2026

“Control over the Strait of Hormuz continues to provide Tehran with significant leverage, and there is little indication it will accept terms that weaken its strategic standing.”

From MarketWatch • Apr. 12, 2026

As these weaken and stiffen over time it can affect walking, talking, eating and breathing.

From BBC • Apr. 10, 2026

It can also weaken statistical results and fails to reveal how languages change over time.

From Science Daily • Apr. 5, 2026

Others thought that if their bodies were going to weaken in space, they should start out as strong as possible, and that meant exercise.

From "Flying to the Moon: An Astronaut's Story" by Michael Collins