adjective, un·health·i·er, un·health·i·est.
- not in a state of good or normal health; in an unsound, weak, or morbid condition.
- symptomatic of or resulting from bad health: an unhealthy pallor.
- not conducive to good health; unhealthful: Night air was formerly considered unhealthy.
- morally bad, harmful, or contaminating: unhealthy examples for the young.
- dangerous; risky: Asking questions in this neighborhood can be unhealthy.
adjective -healthier or -healthiest
- characterized by ill-health; sick; unwell
- characteristic of, conducive to, or resulting from ill-healthan unhealthy complexion; an unhealthy atmosphere
- morbid or unwholesome
- informal dangerous; risky
adj.1590s, “injurious to health,” from un- (1) “not” + healthy. Earlier unhealthsome (1540s), unhealthful (1570s). Of persons, “sickly,” it is attested from 1610s. Related: Unhealthily.