Longman Dictionary of Contemporary English - poisonous

~ adj 1 containing poison or producing poison  (poisonous mushrooms | poisonous snakes) 2 full of unpleasant and unfriendly feelings  (There was a poisonous atmosphere in the household that made Bonita feel very uneasy.) 3 someone who is poisonous seems to get pleasure from causing arguments, unhappiness etc  (That poisonous bastard Lucett told Morris I was seeing his wife.) - poisonously adv