(a.) Having the qualities or effects of poison; venomous; baneful; corrupting; noxious.

bad baleful baneful barfy brackish catching cloying communicable contagious corroding corrosive corrupting corruptive counterproductive damaging dangerous deadly defamatory deleterious destructive detrimental diabolical disadvantageous disserviceable distressing envenomed evil fatal fetid foul fulsome harmful high hurtful icky infectious infective injurious lethal maggoty malefic malevolent malicious malign malignant mawkish mephitic miasmal miasmatic miasmic mischievous mortal nasty nauseant nauseating nauseous noisome noxious offensive ominous overripe pernicious pestiferous pestilent pestilential poison prejudicial rancid rank rebarbative rotten scatheful septic sickening slanderous spoiled stinking toxic toxicant toxiferous venenate veneniferous venenous venomous vicious vile virulent vomity weevily yucky