an Achilles' heel

a crushing defeat a lame duck a paper tiger all fingers and thumbs anemic as weak as a kitten butterfingers cack-handed clumsy effete elephantine eunuch feeble feebleness feebly

الضعف والعجز وسوء الحظ المهارة والكفاءة والتأهيل القوة والبأس والعنف