Definitions for "Infirm"
Not firm or sound; weak; feeble; as, an infirm body; an infirm constitution.
Weak of mind or will; irresolute; vacillating.
lacking physical strength or vitality; "a feeble old woman"; "her body looked sapless"
Keywords:  enfeeble, weaken
To weaken; to enfeeble.
Not solid or stable; insecure; precarious.
lacking firmness of will or character or purpose; "infirm of purpose; give me the daggers" - Shakespeare
Keywords:  confined, illness, bed
confined to bed (by illness)