weakness failing shortcoming flaw fault imperfection defect frailty inadequacy blemish vice limitation want sin demerit dereliction infirmity deficiency drawback lack fallibility lapse failure disadvantage insufficiency vulnerability snag debility defectiveness catch pitfall peccadillo bug gap unsoundness fragility blight instability error impairment susceptibility quirk incompleteness faultiness discredit hole deformity kink difficulty aberration idiosyncrasy miscarriage injury scarcity shortage solecism flimsiness foil disability taint blot corruption problem gremlin impotence enervation invalidity languor liability feebleness irresolution powerlessness decrepitude trouble faintness inconstancy downfall handicap undoing chinks back impediment negative minus hindrance obstacle detriment complication nuisance hiccup debit incommodity hitch inconvenience strike hurdle constraint drag restriction burden