unhealthful (adj.)

• bad
• contaminated
• foul
• harmful
• injurious
• insalubrious
• insanitary
• morbific
• noisome
• noxious
• pathogenic
• peccant
• pestiferous
• polluted
• septic
• sickly
• tainted
• unhealthy
• unhygienic
• unsanitary
• unwholesome