1. (a.) Hurtful; harmful; baneful; pernicious; injurious; destructive\; unwholesome; insalubrious; as, noxious air, food, or climate; pernicious; corrupting to morals; as, noxious practices or examples.

2. (a.) Guilty; criminal.

abhorrent abominable bad bad for bad-smelling baleful baneful barfy base beastly below contempt beneath contempt bitchy brackish catching cloying communicable contagious contaminated contemptible corroding corrosive corrupting corruptive counterproductive crude cussed damaging deadly deleterious despicable destructive detestable detrimental disadvantageous disgusting disserviceable distressing envenomed execrable fecal fetid forbidding foul frowsty frowy frowzy fulsome funky fusty gamy graveolent gross harmful hateful heinous high hurtful icky ignoble ill-smelling infectious infective iniquitous injurious insalubrious insanitary invidious lethal loathsome maggoty malefic maleficent malevolent malicious malign malignant malodorous mawkish mean mephitic miasmal miasmatic miasmic mildewed mildewy mischievous moldy morbific musty nasty nauseant nauseating nauseous nidorous noisome objectionable obnoxious obscene odious odorous offensive olid ominous ornery overripe pathogenic peccant pernicious pestiferous pestilent pestilential poisonous polluted prejudicial putrid rancid rank reasty reasy rebarbative reechy reeking reeky repellent repugnant repulsive revolting rotten scatheful septic sickening sickly smellful smelling smelly spoiled stenchy stinking strong stuffy sulfurous tainted toxic toxicant toxiferous unhealthful unhealthy unhygienic unsanitary unwholesome venenate veneniferous venenous venomous vicious vile virulent vomity weevily wicked yucky