Definition of weakennext
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Synonym Chooser

How is the word weaken distinct from other similar verbs?

Some common synonyms of weaken are cripple, debilitate, disable, enfeeble, sap, and undermine. While all these words 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

When would cripple be a good substitute for weaken?

While in some cases nearly identical to weaken, cripple implies causing a serious loss of functioning power through damaging or removing an essential part or element.

crippled by arthritis

Where would debilitate be a reasonable alternative to weaken?

The words debilitate and weaken can be used in similar contexts, but debilitate suggests a less marked or more temporary impairment of strength or vitality.

the debilitating effects of surgery

When could disable be used to replace weaken?

While the synonyms disable and weaken are close in meaning, disable suggests bringing about impairment or limitation in a physical or mental ability.

disabled by an injury sustained at work

When might enfeeble be a better fit than weaken?

The synonyms enfeeble and weaken are sometimes interchangeable, but enfeeble implies a condition of marked weakness and helplessness.

enfeebled by starvation

How are the words undermine and sap related as synonyms of weaken?

Both 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

Example Sentences

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.
Recent Examples of weaken The pandemic, in turn, spread panic and left behind mistrust, weakening faith in civic and religious authorities. Vann R. Newkirk Ii, The Atlantic, 9 Feb. 2026 Israel later launched a widespread bombardment of Lebanon that severely weakened Hezbollah, followed by a ground invasion. Los Angeles Times, 9 Feb. 2026 Anything that weakens fibers can worsen pilling. Brandee Gruener, Southern Living, 9 Feb. 2026 So, the underlying use case didn't weaken just because silver prices pulled back. Angelica Leicht, CBS News, 9 Feb. 2026 See All Example Sentences for weaken
Recent Examples of Synonyms for weaken
Verb
  • Williams did not explicitly mention tennis, or any sport, in her Super Bowl advert for Ro, but her focus on movement and wellbeing in the context of her softening position on the possibility of a comeback was striking.
    James Hansen, New York Times, 9 Feb. 2026
  • On most prestige shows, a friendship between two women from disparate backgrounds would serve as an emotional anchor, softening both characters.
    Inkoo Kang, New Yorker, 9 Feb. 2026
Verb
  • When Dreher wrote The Benedict Option, during the Obama presidency, his primary concern was how to keep faith alive at a time when Christianity seemed to be fading away.
    Robert F. Worth, The Atlantic, 13 Feb. 2026
  • Relationship endings are possible under this influence — don’t insist on forcing a connection that’s trying to fade.
    Tarot.com, Chicago Tribune, 13 Feb. 2026
Verb
  • Give your plant orchid food or a balanced fertilizer diluted to half strength.
    Karen Brewer Grossman, Southern Living, 13 Feb. 2026
  • The poetry of Brontë’s language is likewise diluted.
    Ana Gutierrez, Austin American Statesman, 11 Feb. 2026
Verb
  • Dozens more were injured, many suffering serious or life-threatening injuries.
    Alexandra Banner, CNN Money, 11 Feb. 2026
  • Italy’s national fire and rescue service, Vigili del Fuoco, reported that, over the weekend, two people died and one was seriously injured in Alpe Meriggio in Valtellina after being caught in an avalanche that fatally buried at least one of the victims.
    Bonny Chu, FOXNews.com, 11 Feb. 2026
Verb
  • In fact, one shopper even credits it with improving sagging corners around the mouth and forehead creasing.
    Melanie Fincher, Southern Living, 10 Feb. 2026
  • Unlike your average and typical pillow that sags over time, this one has hotel-like appeal because of its precise border for a structured, refined look.
    Nashia Baker, Architectural Digest, 10 Feb. 2026
Verb
  • Lung, stomach and cervical cancers accounted for nearly half of the cases that were linked to modifiable risks, with many linked to viruses and bacteria like the human papillomavirus (HPV), hepatitis B and C, and Helicobacter pylori (a common bacterium that infects the stomach lining).
    Melissa Rudy, FOXNews.com, 5 Feb. 2026
  • Those infected in South Carolina who haven’t yet developed encephalitis may yet do so.
    Meghan Bartels, Scientific American, 5 Feb. 2026
Verb
  • While some lucky people never feel ill, that queasiness can be pretty debilitating for many others—more so in the first trimester, but occasionally throughout the entire pregnancy.
    Julia Ries Wexler, SELF, 9 Feb. 2026
  • In September 2021, Valle began waking up with painful headaches that would become debilitating throughout the day.
    CBS News, CBS News, 7 Feb. 2026
Verb
  • That shutdown ended with a promise to vote on extending the subsidies, which failed.
    Riley Beggin, Arkansas Online, 14 Feb. 2026
  • Previous versions of the bill failed to gain traction in both chambers last year.
    Swapna Venugopal Ramaswamy, USA Today, 14 Feb. 2026

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Cite this Entry

“Weaken.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/weaken. Accessed 16 Feb. 2026.

More from Merriam-Webster on weaken

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