feeble

pathetically lacking in force or effectiveness; "a feeble excuse"; "a lame argument"

lacking strength or vigor; "damning with faint praise"; "faint resistance"; "feeble efforts"; "a feeble voice"

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

lacking strength; "a weak, nerveless fool, devoid of energy and promptitude"- Nathaniel Hawthorne