(n.) The quality or condition of being imperfect; want of perfection; incompleteness; deficiency; fault or blemish.

absence arrear arrearage arrears bad habit baseness beggary besetting sin blemish bug catch crack damage decline defalcation default defect defection defectiveness deficiency deficit delinquency demerit deprivation destitution drawback drought error failing failure fallibility falling short famine fault faute fewness flaw foible frailty hole impoverishment inadequacy incompetence incompleteness inferiority infirmity insufficiency kink lack little problem littleness maladroitness meanness mediocrity moral flaw need omission peccadillo pettiness problem rift shabbiness short measure shortage shortcoming shortfall sin slump smallness snag something missing starvation subnormality taint triviality underage unskillfulness vice vulgarity vulnerable place want wantage weak link weak point weak side weakness