weaken

verb

weak·​en ˈwē-kən How to pronounce weaken (audio)
weakened; weakening
ˈwēk-niŋ,
ˈwē-kə- How to pronounce weaken (audio)
; weakens

transitive verb

1
: to make weak : lessen the strength of
2
: to reduce in intensity or effectiveness

intransitive verb

: to become weak
weakener
ˈwēk-nər
ˈwē-kə- How to pronounce weaken (audio)
noun
Choose the Right Synonym for weaken

weaken, enfeeble, debilitate, undermine, sap, disable mean to lose or cause to lose strength or vigor.

weaken may imply loss of physical strength, health, soundness, or stability or of quality, intensity, or effective power.

a disease that weakens the body's defenses

enfeeble implies a condition of marked weakness and helplessness.

enfeebled by starvation

debilitate suggests a less marked or more temporary impairment of strength or vitality.

the debilitating effects of surgery

undermine and sap suggest a weakening by something working surreptitiously and insidiously.

a poor diet undermines your health
drugs had sapped his ability to think

disable suggests bringing about impairment or limitation in a physical or mental ability.

disabled by an injury sustained at work

Examples of weaken in a Sentence

The disease weakens the immune system. Some are concerned that the increase in taxes will weaken the economy. The beams had been weakened by water damage. efforts to weaken environmental laws The recent setbacks have not weakened our resolve. These kinds of contradictions weaken your argument. The disease causes the immune system to weaken. The dollar has continued to weaken against the euro. Lower interest rates have weakened the dollar.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The widening yield differentials between Chinese and U.S. sovereign bonds could risk encouraging capital outflows and put further pressure on the yuan that has been weakening against the greenback. Anniek Bao, CNBC, 10 Jan. 2025 Elon Musk, one of Trump’s confidants, has already met with Iran’s UN ambassador; now that Israel has weakened Tehran and pummeled its proxies in the Middle East, a diplomatic breakthrough may be achievable. Charles A. Kupchan, The Atlantic, 10 Jan. 2025 Some of those decisions, like the 2023 counteroffensive and the 2024 offensive in Kursk, Russia, have weakened Ukraine on the battlefield and therefore hurt its position when negotiations commence. Paul Du Quenoy, Newsweek, 9 Jan. 2025 Air pollution experts note that blueprints from conservative groups with connections to Trump, such as Project 2025 and America First Agenda, have policy proposals that will weaken the environmental agency’s authority to enforce strict air quality standards. Ignacio Calderon, USA TODAY, 9 Jan. 2025 See all Example Sentences for weaken 

Word History

First Known Use

circa 1529, in the meaning defined at transitive sense 1

Time Traveler
The first known use of weaken was circa 1529

Dictionary Entries Near weaken

Cite this Entry

“Weaken.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/weaken. Accessed 18 Jan. 2025.

Kids Definition

weaken

verb
weak·​en ˈwē-kən How to pronounce weaken (audio)
weakened; weakening ˈwēk-(ə-)niŋ How to pronounce weaken (audio)
: to make or become weak or weaker

More from Merriam-Webster on weaken

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