weakness

weakness (http://definr.com/weakness)

     n 1: a flaw or weak point; "he was quick to point out his wife's
          failings" [syn: failing]
     2: powerlessness revealed by an inability to act; "in spite of
        their weakness the group remains highly active" [syn: helplessness,
         impuissance]
     3: the property of lacking physical or mental strength;
        liability to failure under pressure or stress or strain;
        "his weakness increased as he became older"; "the weakness
        of the span was overlooked until it collapsed" [ant: strength]
     4: the condition of being financially weak; "the weakness of
        the dollar against the yen" [ant: strength]
     5: a penchant for something even though it might not be good
        for you; "he has a weakness for chocolate"