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poi‧son‧ous

1 containing poison or producing poison :
Some mushrooms are extremely poisonous.
poisonous gases such as hydrogen sulfide
poisonous substances
Some mushrooms are extremely poisonous.
poisonous gases such as hydrogen sulfide
poisonous substances2 full of bad and unfriendly feelings :
the poisonous atmosphere of the office
the poisonous atmosphere of the office3 British English someone who is poisonous seems to get pleasure from causing arguments, unhappiness etc :
That poisonous bastard Lucett told Morris I was seeing his wife.
That poisonous bastard Lucett told Morris I was seeing his wife. —poisonously adverb
