Etymology
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unhealthy (adj.)

1590s, "injurious to health," from un- (1) "not" + healthy (adj.). Earlier unhealthsome (1540s), unhealthful (1570s). Of persons, "sickly," it is attested from 1610s. Related: Unhealthily.

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Definitions of unhealthy

unhealthy (adj.)
not in or exhibiting good health in body or mind;
unhealthy ulcers
unhealthy (adj.)
detrimental to health;
Synonyms: insalubrious / unhealthful
unhealthy (adj.)
not conducive to good health;
an unhealthy diet of fast foods
an unhealthy climate
From wordnet.princeton.edu