adj. 25B6; adjective
she cares for infirm people : FRAIL, weak, feeble, debilitated, decrepit, disabled; ill, unwell, sick, sickly, poorly, indisposed, ailing.
(archaic) he was infirm of purpose : WEAK, uncertain, indefinite, indecisive, irresolute, unresolved, undecided; wavering, vacillating.
healthy, strong.