The Oxford Thesaurus An A-Z Dictionary of Synonyms - unhealthy adj.

1) ailing, unwell, ill, sickly, infirm, feeble, frail, debilitated, unsound, sick, in poor or delicate health or condition, indisposed, invalid, valetudinary: The boys had pasty, unhealthy faces. 2) unwholesome, harmful, noxious, detrimental, insalubrious, damaging, injurious, destructive, malign: The doctor said that this climate is unhealthy for people with respiratory disorders. 3) risky, dangerous, perilous, life-threatening, touch-and-go: You might find it unhealthy to criticize the government here.