Meaning of “infirm” in the English Dictionary

"infirm" in British English

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infirmadjective

uk /ɪnˈfɜːm/ us /ɪnˈfɝːm/ formal

infirmnoun [ plural ]

uk /ɪnˈfɜːm/ us /ɪnˈfɝːm/ formal
the infirm

people who are ill for long periods:

The old and the infirm are the most susceptible to this disease.

(Definition of “infirm” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"infirm" in American English

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infirmadjective

us /ɪnˈfɜrm/

physically or mentally weak, esp. because of old age or illness

(Definition of “infirm” from the Cambridge Academic Content Dictionary © Cambridge University Press)