adj. 25B6; adjective
an unhealthy lifestyle : HARMFUL, detrimental, destructive, injurious, damaging, deleterious; malign, noxious, poisonous, insalubrious, baleful.
an unhealthy pallor : ILL-LOOKING, ill, unwell, in poor health, ailing, sick, sickly, poorly, indisposed, weak, frail, delicate, infirm, washed out, run down, peaky.
an unhealthy obsession with drugs : UNWHOLESOME, morbid, macabre, twisted, abnormal, warped, depraved, unnatural; informal sick.