• IPA: /ˈpɔɪzənəs/, /ˈpɔɪznəs/


  1. Containing sufficient poison to be dangerous to touch or ingest.
    • 2003, Charles L. Fergus, Common Edible and Poisonous Mushrooms of the Northeast, Stackpole Books (ISBN 9780811726412), page 77:
      I had picked a mushroom so poisonous that particles of it, stuck to my fingers and accidentally swallowed, could have made me deathly ill, and a piece the size of my thumb could have killed me.
    Synonyms: poisoned, toxic, venomous, attery
    Antonyms: nonpoisonous, unpoisonous
  2. (figuratively) Negative, harmful.
    • 2013, Kylie Griffin, Allegiance Sworn, Penguin (ISBN 9781101622094)
      He didn't want to end up like his grandfather, bitter and intractable, consumed in his hatred like an addict on haze — a poisonous attitude that would possess him all his remaining years.
    Synonyms: toxic

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