- Being in a state of ill health; sick.
- Characterized by or symptomatic of ill health: an unhealthy pallor.
- Causing or conducive to poor health; unwholesome: an unhealthy diet.
- Harmful to character or moral health; corruptive: unhealthy reading material.
- Characterized by or symptomatic of disturbed mental health: took an unhealthy interest in violence and fires.
- Of a risky nature; dangerous: an unhealthy predicament.