[syn: insalubrious, unhealthful, unhealthy]
The Collaborative International Dictionary of English v.0.48:
Unhealthful \Unhealthful\
   See healthful.
WordNet (r) 3.0 (2006):
unhealthful
    adj 1: not sanitary or healthful; "unsanitary open sewers";
           "grim and unsanitary conditions" [syn: unsanitary,
           insanitary, unhealthful] [ant: healthful,
           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, unhealthful,
       unhealthy]
Moby Thesaurus II by Grady Ward, 1.0:
22 Moby Thesaurus words for "unhealthful":
   bad, bad for, contaminated, foul, harmful, injurious, insalubrious,
   insanitary, morbific, noisome, noxious, pathogenic, peccant,
   pestiferous, polluted, septic, sickly, tainted, unhealthy,
   unhygienic, unsanitary, unwholesome