unhealthy adj 1: not in or exhibiting good health in body or mind; "unhealthy ulcers" [ant: {healthy}] 2: detrimental to health [syn: {insalubrious}, {unhealthful}] 3: not conducive to good health; "an unhealthy diet of fast foods"; "an unhealthy climate" [also: {unhealthiest}, {unhealthier}] unhealthier See {unhealthy}