absence, adulteration, asymmetry, beggary, blemish, bug, catch, contrariety, crack, defect, defectibility, defection, defectiveness, deficiency, deficit, demerit, deprivation, destitution, difference, disequilibrium, disparity, disproportion, drawback, drought, erroneousness, failing, failure, fallibility, famine, fault, faultiness, faute, flaw, foible, frailty, heterogeneity, hole, imbalance, immaturity, impairment, imperfection, impoverishment, impurity, inaccuracy, inadequacy, inadequateness, incompleteness, inequality, inequity, inexactitude, inexactness, infirmity, injustice, insufficiency, irregularity, kink, lack, liability, little problem, mediocrity, need, nonuniformity, odds, omission, overbalance, patchiness, problem, rift, shortage, shortfall, sin, sketchiness, snag, something missing, starvation, taint, unbalance, undevelopment, unevenness, unfair discrimination, unperfectedness, unsoundness, vulnerable place, want, wantage, weak link, weak point, weakness