unhealthy /ʌnˈhɛl.θi/ adjective4 •Characterized by, or conducive to poor health.The villagers lived in unhealthy surroundings. •Characterized by disturbed mental health.He had an unhealthy interest in fire. •Sick or ill.He was an unhealthy child. •Tending to corrupt.He liked unhealthy reading material. formsmore unhealthy · unhealthier · most unhealthy · unhealthiest