INFIRM Synonyms: 99 Similar and Opposite Words

Q: How does the adjective 'infirm' contrast with its synonyms?

Some common synonyms of infirm are decrepit , feeble , fragile , frail , and weak . While all these words mean "not strong enough to endure strain, pressure, or strenuous effort," infirm suggests instability, unsoundness, and insecurity due to old age or crippling illness. // infirm residents requiring constant care

Q: When would 'decrepit' be a good substitute for 'infirm'?

While the synonyms decrepit and infirm are close in meaning, decrepit implies being worn-out or broken-down from long use or old age. // the dowager's decrepit retainers

Q: In what contexts can 'feeble' take the place of 'infirm'?

Although the words feeble and infirm have much in common, feeble suggests extreme weakness inviting pity or contempt. // a feeble attempt to walk

Q: When could 'fragile' be used to replace 'infirm'?

The synonyms fragile and infirm are sometimes interchangeable, but fragile suggests frailty and brittleness unable to resist rough usage. // a reclusive poet too fragile for the rigors of this world

Q: When is it sensible to use 'frail' instead of 'infirm'?

The words frail and infirm are synonyms, but do differ in nuance. Specifically, frail implies delicacy and slightness of constitution or structure. // a frail teenager unable to enjoy sports

Q: When can 'weak' be used instead of 'infirm'?

The meanings of weak and infirm largely overlap; however, weak applies to deficiency or inferiority in strength or power of any sort. // felt weak after the surgery

infirm

adjective

in-ˈfərm

Definition of infirm

as in weak

lacking bodily strength the elderly and infirm have to be especially careful during the winter months

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How does the adjective infirm contrast with its synonyms?

Some common synonyms of infirm are decrepit, feeble, fragile, frail, and weak. While all these words mean "not strong enough to endure strain, pressure, or strenuous effort," infirm suggests instability, unsoundness, and insecurity due to old age or crippling illness.

infirm residents requiring constant care

When would decrepit be a good substitute for infirm?

While the synonyms decrepit and infirm are close in meaning, decrepit implies being worn-out or broken-down from long use or old age.

the dowager's decrepit retainers

In what contexts can feeble take the place of infirm?

Although the words feeble and infirm have much in common, feeble suggests extreme weakness inviting pity or contempt.

a feeble attempt to walk

When could fragile be used to replace infirm?

The synonyms fragile and infirm are sometimes interchangeable, but fragile suggests frailty and brittleness unable to resist rough usage.

a reclusive poet too fragile for the rigors of this world

When is it sensible to use frail instead of infirm?

The words frail and infirm are synonyms, but do differ in nuance. Specifically, frail implies delicacy and slightness of constitution or structure.

a frail teenager unable to enjoy sports

When can weak be used instead of infirm?

The meanings of weak and infirm largely overlap; however, weak applies to deficiency or inferiority in strength or power of any sort.

felt weak after the surgery

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 infirm In June, because of Austen’s worsening condition and a bureaucratic glitch, plans were being set in motion to move her to Welfare Island, then a location of public institutions for the aged and infirm. — Margaret Hetherman, NBC news, 19 Oct. 2025 Earlier this month, Nancy Guthrie, the elderly and infirm mother of Today show co-anchor Savannah Guthrie, was violently taken from her home in Tucson, Arizona. — Tony Maglio, HollywoodReporter, 24 Feb. 2026 Executive orders that are constitutionally infirm; unwarranted attacks on public sector employees; taxation policy favoring the ultra-wealthy. — U T Readers, San Diego Union-Tribune, 2 Nov. 2025 The four Democratic members of the JBC, which controls the state budget, asked with growing consternation why the Department of Corrections hadn’t brought them a plan to address overcrowding, to step up releases of old and infirm inmates, or to improve its own shortcomings. — Seth Klamann, Denver Post, 22 Jan. 2026 See All Example Sentences for infirm

Recent Examples of Synonyms for infirm

Adjective

Following a year of historically weak hiring in 2025, hiring rebounded this spring.

— Rachel Barber, USA Today, 2 July 2026
In a weak free-agency class, centers Robert Williams III (Portland) and Mark Williams (Phoenix) are already off the market, each reportedly agreeing to return to their current teams.

— Broderick Turner, Los Angeles Times, 1 July 2026

Definition of weak

Adjective

The law had said medically frail people include those who have substance use disorders, disabilities or serious medical conditions.

— ABC News, ABC News, 29 June 2026
Roosevelt credits that experience with transforming him from a frail, nearsighted youth into a rugged individual who years later would become the 26th president and a pioneering conservationist.

— Joe Yogerst, CNN Money, 26 June 2026

Definition of frail

Adjective

The bacterium can also lead to hemolytic uremic syndrome (HUS), a serious complication that is more common in young children, older adults and people with weakened immune systems, according to the release.

— Chiara Kim, PEOPLE, 6 July 2026
While anyone can get sick, young children, older adults, pregnant women and people with weakened immune systems are more likely to become seriously ill.

— Tiffani Jackson, Fort Worth Star-Telegram, 3 July 2026

Definition of weakened

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“Infirm.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infirm. Accessed 7 Jul. 2026.

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Synonyms of infirm

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