Longman Dictionary of Contemporary English homepage

poisonous

adjective
     
poi‧son‧ous
1 containing poison or producing poison:
Some mushrooms are extremely poisonous.
poisonous gases such as hydrogen sulfide
poisonous substances
She was bitten on the ankle by a poisonous snake.
poisonous to
The berries are poisonous to birds.
2 full of bad and unfriendly feelings:
the poisonous atmosphere of the office
3 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.
poisonously adverb

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