Synonyms and related words :
ailing, bad, bad for, cachectic, chancy, contaminated, corrupt, damaging, dangerous, debilitated, degenerate, depraved, destructive, detrimental, diseased, doubtful, drained, dubious, enervated, exhausted, failing, feeble, flagitious, foul, frail, hairy, harmful, hazardous, healthless, ill, in poor health, indisposed, infirm, injurious, insalubrious, insanitary, insecure, invalid, jeopardous, languishing, malign, morbid, morbific, moribund, nefarious, noisome, noxious, pale, pathogenic, pathological, peaked, peaky, peccant, perilous, perverse, pestiferous, polluted, putrid, reduced, reduced in health, risky, rocky, rotten, run-down, septic, shaky, sick, sickly, tainted, tottery, touch-and-go, treacherous, uncertain, undependable, unhealthful, unhygienic, unpredictable, unreliable, unsafe, unsanitary, unsound, unstable, unsteady, unsure, untrustworthy, unwell, unwholesome, valetudinarian, valetudinary, vicious, villainous, weakened, weakly, wicked, with low resistance