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EnglishEdit

EtymologyEdit

From poison +‎ -ous.

PronunciationEdit

AdjectiveEdit

poisonous (comparative more poisonous, superlative most poisonous)

  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), 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: toxic, venomous, attery (dialectal or archaic)
    Antonyms: nonpoisonous, unpoisonous
  2. (figuratively) Negative, harmful.
    • 2013, Kylie Griffin, Allegiance Sworn, Penguin (→ISBN)
      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.
    Synonym: toxic

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