1. Not sanitary or healthful
   - unsanitary, insanitary 
2. Detrimental to good health
   "unhealthful air pollution"; "unhealthful conditions in old apartments with peeling lead-based paint" 
3. Detrimental to health
   - insalubrious, unhealthy

See also: crippling, cytopathogenic, disabling, incapacitating, infected, infective, morbific, nonmedicinal, pathogenic, septic, toxic, unhealthfulness, unhealthy, unhygienic, unmedical, unmedicative, unmedicinal, unwholesome

Antonym: healthful

• angiotensin
• angiotensin I
• angiotensin II
• angiotensin II inhibitor
• angiotensin-converting enzyme
• angiotensin-converting enzyme inhibitor
• angiotonin
• angle
• angle bracket
• angle iron
• angle of attack
• angle of dip
• angle of extinction
• angle of incidence
• angle of inclination
• angle of reflection
• angle of refraction
• angle of view
• angle-closure glaucoma
• angle-park
• angled
• angled loofah
• angledozer
• angler
• anglerfish