Synonyms of infirm

Adjective

1. decrepit, debile, feeble, infirm, rickety, sapless, weak, weakly, frail (vs. robust)

usage: lacking bodily or muscular strength or vitality; "a feeble old woman"; "her body looked sapless"

2. infirm, irresolute (vs. resolute)

usage: lacking firmness of will or character or purpose; "infirm of purpose; give me the daggers" - Shakespeare

Definition and meaning of infirm (Dictionary)