Source : WordNet®

unhealthful
     adj 1: not sanitary or healthful; "unsanitary open sewers"; "grim
            and unsanitary conditions" [syn: {unsanitary}, {insanitary}]
            [ant: {sanitary}]
     2: detrimental to good health; "unhealthful air pollution";
        "unhealthful conditions in old apartments with peeling
        lead-based paint" [ant: {healthful}]
     3: detrimental to health [syn: {insalubrious}, {unhealthy}]