feeble
adj.
pathetically lacking in force or effectiveness
a feeble excuse|a lame argument
Synonym: lame
adj.
lacking strength or vigor
damning with faint praise|faint resistance|feeble efforts|a feeble voice
Synonym: faint
adj.
lacking bodily or muscular strength or vitality
a feeble old woman|her body looked sapless
adj.
lacking strength
a weak, nerveless fool, devoid of energy and promptitude
Synonym: nerveless