adjective
sick
Synonyms: ailing, below par, debilitated, delicate, diseased, down, dragging, feeble, frail, ill, in a decline, infirm, in ill health, in poor health, invalid, laid low, out of action, out of shape, peaked, poorly, run-down, shaky, sickly, unsound, unwell, weak
Antonyms: healthy, strong, well
adjective
very bad in effect on well-being
Synonyms: baneful, chancy, corrupt, corrupting, dangerous, degenerate, degrading, deleterious, demoralizing, detrimental, harmful, hazardous, insalubrious, jeopardous, morbid, nefarious, negative, noisome, noxious, perilous, perverse, poisonous, risky, rotten, treacherous, undesirable, unhealthful, unsanitary, unsound, unwholesome, villainous, virulent, wicked
Antonyms: good, healthy