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