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

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Synonym Chooser

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 The victim of the offense was a person with a disability and the defendant knew or should have known that the victim was a person with a disability or mentally or physically infirm. — IndyStar, 6 Oct. 2025 Many of those deaths are of infirm inmates who were transferred to the state’s prison hospital in Raleigh for care and died there, records show. — Charlotte Observer, 4 Aug. 2025 The public and police are encouraged to check on the elderly and infirm. — Cory Franklin, Chicago Tribune, 13 July 2025 For the elderly or infirm, these displays could show electrocardiogram waveforms, collecting the data from wireless electrodes placed elsewhere on the body. — IEEE Spectrum, 27 May 2021 See All Example Sentences for infirm

Recent Examples of Synonyms for infirm

Adjective

Many African economies are in a much weaker economic position compared to the strong 2015-2016 El Niño, the IIF report said, largely due to higher oil prices, which have driven up transport costs, and a strong US dollar.

— Paige Bruton, semafor.com, 2 Sep. 2026
Too much nitrogen in the spring creates a weak root system that isn’t able to withstand the heat and drought in summer.

— Megan Hughes, Better Homes & Gardens, 2 Sep. 2026

Definition of weak

Adjective

Though Steinem had recently become more frail physically, her wit and humor remained totally intact.

— ABC News, ABC News, 3 Sep. 2026
In the last decade, Jackson has paid a Miami company more than $35 million to discharge mostly frail patients with nowhere to go into assisted living beds.

— Carol Marbin Miller, Miami Herald, 27 Aug. 2026

Definition of frail

Adjective

Most often, those who do seek medical attention are people who are more susceptible to foodborne illnesses, such as children, older adults, pregnant people and people with weakened immune systems.

— Kimberly Baker, The Conversation, 31 Aug. 2026
Most people recover within several days, but infections can become serious for young children, older adults and people with weakened immune systems.

— Anthony Thompson, USA Today, 28 Aug. 2026

Definition of weakened

Adjective

Kenneth Branagh originated the somewhat aloof professor, who steps into the role after Professor Quirrell was revealed to be hosting the feeble Lord Voldemort on the back of his bald head.

— Dessi Gomez, Deadline, 1 Sep. 2026
Instead of using a mirror to gather starlight, MOTHRA has many telephoto lenses, like those on a camera, which can capture faintly glowing wisps of gas and other feeble emanations across a wider field of view.

— Mary Randolph, Scientific American, 12 Aug. 2026

Definition of feeble

Adjective

Related Stories The film follows Di Marco’s titular character, a disabled young adult who works as a dominant at a fetish house.

— Rafa Sales Ross, Variety, 28 Aug. 2026
David Lugo earned a modest living as a mechanic throughout his life, supporting his mother and disabled sister, but three years ago, the 60-year-old's kidneys failed.

— Rina Nakano, CBS News, 28 Aug. 2026

Definition of disabled

Browse Nearby Words

infinity

infirm

infirmaries

See all Nearby Words

Cite this Entry

Style

“Infirm.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infirm. Accessed 5 Sep. 2026.

Copy Citation

Synonyms of infirm

adjective

Synonym Chooser

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

matriculate

Popular in Grammar & Usage

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

A List of Most Commonly Confused Words

Why do we use apostrophes to show possession?

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Popular in Wordplay

The Longest Long Words List

Stay Woke

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

The Words of the Week - Sept. 4

Popular

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

The Longest Long Words List

Stay Woke

Games & Quizzes