/ ɪnˈfɜːm; NAmE ɪnˈfɜːrm/ adjective
1.
ill / sick and weak, especially over a long period or as a result of being old
2.
the infirm noun [ pl. ] people who are weak and ill / sick for a long period :
care for the elderly and infirm
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WORD ORIGIN
late Middle English (in the general sense weak, frail ): from Latin infirmus , from in- not + firmus firm.