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Adjective: infirm (infirmer,infirmest)  in'furm
  1. Lacking bodily or muscular strength or vitality
    - decrepit, debile [archaic], feeble, rickety, sapless, weak, weakly
  2. Lacking firmness of will, character or purpose
    "infirm of purpose; give me the daggers"

Derived forms: infirmer, infirmest

See also: frail, irresolute

Encyclopedia: Infirm