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 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 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 See All Example Sentences for infirm

Recent Examples of Synonyms for infirm

Adjective

Studies have shown that countries with stronger IP systems tend to be more innovative, while weaker IP systems may stifle innovation.

— Andrei Iancu, Fortune, 20 Oct. 2026
Are scientists hindered by a weak grasp of the physics driving GRBs?

— Robin George Andrews, Scientific American, 20 Oct. 2026

Definition of weak

Adjective

At a concert this past weekend in Cincinnati, the Beach Boys’ first show since July, apart from a private performance in Dana Point, California, Love appeared somewhat frail, according to a fan video.

— Hilary Lewis, HollywoodReporter, 14 Oct. 2026
The curtain then opened to reveal a frail Mike Love seated in a chair at the center of the stage.

— Andy Greene, Rolling Stone, 12 Oct. 2026

Definition of frail

Adjective

Special protection Vaccination is especially important for those 65 years and older, young children, pregnant people, people with chronic medical conditions and those with weakened immune systems.

— Annette Regan, The Conversation, 6 Oct. 2026
Leadership turmoil and a weakened state, as seen with the enfeebled late Ming, could well fuse with latent social tensions to produce an existential crisis.

— Carl Minzner, Foreign Affairs, 5 Oct. 2026

Definition of weakened

Adjective

Then, Washington tight end Decker DeGraaf caught a pass and took off down the sideline, the former Glendora High standout running through two feeble-arm tackles on the way to an inexplicable 42-yard touchdown.

— Los Angeles Times, Los Angeles Times, 4 Oct. 2026
Briogeo Destined for Density Serum The Briogeo Destined for Density Serum is a lightweight liquid formula that thickens feeble strands, plumps roots, and rapidly spurs new hair growth.

— Sophie Wirt, InStyle, 17 Sep. 2026

Definition of feeble

Adjective

The movie offered a sly critique of Korea’s rapid urbanization, and introduced the wayward types (bar girls, severely disabled men) that would populate all of Lee’s films.

— E. Tammy Kim, New Yorker, 12 Oct. 2026
The closure is part of a project to improve access for disabled visitors and replace the library’s heating and air conditioning system.

— Don Sweeney, Sacbee.com, 11 Oct. 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 21 Oct. 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

jilt

Popular in Grammar & Usage

Merriam-Webster’s Great Big List of Words You Love to Hate

'Can' vs. 'May'

'Affect' vs. 'Effect'

More Commonly Mispronounced Words

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

Popular in Wordplay

The Longest Long Words List

9 Words That Sound Like Insults But Aren't

Did 'orange' the fruit or the color come first?

Even More Bird Names that Sound Like Insults (and Sometimes Are)

12 Lovely and Unusual Words for the Natural World

Popular

Merriam-Webster’s Great Big List of Words You Love to Hate

The Longest Long Words List

9 Words That Sound Like Insults But Aren't

Games & Quizzes