1. noxious
2. baneful, deadly, pernicious, pestilent, corrupting, degrading, vesicatory, vesicant, toxic, unwholesome, dangerous
3. unsafe, harmful
4. abusive, bad, bruising, calumniatory, calumnious, defamatory, denigrative, denigrating, denigratory, libellous, libelous, slanderous, catastrophic, ruinous, counterproductive, damaging, detrimental, prejudicial, prejudicious, ill, insidious, pernicious, subtle, mischievous, nocent, stabbing, traumatic, wounding, deleterious, hurtful, injurious, destructive, disadvantageous, malign, noxious, offensive, painful, toxic, unwholesome, disadvantageous
5. minus, negative, inexpedient, inopportune, adverse
6. inauspicious, untoward, unfavorable, unfavourable, evil
6. injurious, malign