infirm

adjective

in·​firm in-ˈfərm 

1

: of poor or deteriorated vitality

especially : feeble from age

2

: weak of mind, will, or character : irresolute, vacillating

infirm in purpose

3

: not solid or stable : insecure

the infirm state of the barn

infirmly adverb

Synonyms of infirm

• weak
• frail
• weakened
• feeble
• disabled

Choose the Right Synonym for infirm

weak, feeble, frail, fragile, infirm, decrepit mean not strong enough to endure strain, pressure, or strenuous effort.

weak applies to deficiency or inferiority in strength or power of any sort.

felt weak after the surgery

feeble suggests extreme weakness inviting pity or contempt.

a feeble attempt to walk

frail implies delicacy and slightness of constitution or structure.

a frail teenager unable to enjoy sports

fragile suggests frailty and brittleness unable to resist rough usage.

a reclusive poet too fragile for the rigors of this world

infirm suggests instability, unsoundness, and insecurity due to old age or disabling illness.

infirm residents requiring constant care

decrepit implies being worn-out or broken-down from long use or old age.

the dowager's decrepit retainers

Examples of infirm in a Sentence

The clinic provides free care for elderly and infirm people who lack health insurance.

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

Recent Examples on the Web

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

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

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

In September, late night TV turns 71, ancient by television standards and, until recently, not infirm — one of American pop culture’s most durable inventions and exports. —Steven Zeitchik, HollywoodReporter, 7 Aug. 2025

Word History

Etymology

Middle English, from Latin infirmus, from in- + firmus firm

First Known Use

1608, in the meaning defined at sense 1

Phrases Containing infirm

• the infirm

Rhymes for infirm

• affirm
• bookworm
• confirm
• cutworm
• earthworm
• midterm
• tapeworm
• wireworm
• angiosperm
• echinoderm
• berm
• ferm

Kids Definition

infirm

adjective

in·​firm in-ˈfərm 

: weak or frail in body (as from age or disease)

Medical Definition

infirm

adjective

in·​firm in-ˈfərm 

: of poor or deteriorated vitality

especially : feeble from age