"unhealthful" in the adjective sense
1. unsanitary, insanitary, unhealthful
not sanitary or healthful
"unsanitary open sewers"
"grim and unsanitary conditions"
2. unhealthful
detrimental to good health
"unhealthful air pollution"
"unhealthful conditions in old apartments with peeling lead-based paint"
3. insalubrious, unhealthful, unhealthy
detrimental to health
Source: WordNet® (An amazing lexical database of English)
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