Synonyms and related words :
abortive, arrested, bad habit, besetting sin, blemish, blind spot, bootless, bug, cachectic, callow, catch, comedown, coming apart, crack, cracking, crumbling, debasement, debilitated, decadence, decadency, decadent, declension, declination, decline, declining, defect, defection, defective, deficiency, deficient, deformation, degeneracy, degenerate, degenerateness, degeneration, degradation, demotion, depravation, depravedness, depreciation, derogation, descent, deteriorating, deterioration, devolution, disintegrating, downtrend, downturn, downward mobility, downward trend, drained, draining, drawback, drooping, drop, dwindling, dying, ebb, ebbing, effete, effeteness, embryonic, enervated, exhausted, fading, failed, failure, failure of nerve, fall, falling, falling-off, fault, faute, feeble, flagging, flaw, foible, found wanting, fragmenting, frail, frailty, fruitless, futile, going to pieces, healthless, hole, hypoplastic, immature, imperfect, imperfection, in arrear, in arrears, in default, in default of, in poor health, in short supply, inadequacy, inadequate, incompetent, incomplete, ineffective, ineffectual, inefficacious, infant, infirm, infirmity, insufficient, invalid, involution, kink, lacking, lame, languishing, lapse, little problem, loss of tone, manque, marcescent, miscarried, miscarrying, missing, moral flaw, moribund, needing, not enough, of no effect, pale, part, partial, patchy, peaked, peaky, pining, problem, reduced, reduced in health, regression, regressive, retrocession, retrogradation, retrograde, retrogression, retrogressive, rift, run-down, sans, scant, scanty, scarce, scrappy, short, shortcoming, shriveling, shy, sickly, sinking, sketchy, sliding, slippage, slipping, slump, slumping, snag, something missing, stickit, stillborn, subsiding, successless, tabetic, taint, too little, underdeveloped, undeveloped, unequal to, unfortunate, unhealthy, unqualified, unsatisfactory, unsatisfying, unsound, unsuccessful, unsufficing, useless, valetudinarian, valetudinary, vice, vulnerable place, wane, waning, wanting, wasting, weak link, weak point, weak side, weakened, weakly, weakness, wilting, with low resistance, withering, without, worsening