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Synonyms
poi·son·ous (poízə-nəs)

adjective 

  1. Capable of harming or killing by or as if by poison; toxic or venomous.
  2. Containing a poison.
  3. Marked by apparent ill will: “poisonous hate . . . in his eyes” (Ernest Hemingway)

derivatives

poíson·ous·ly
adverb
poíson·ous·ness
noun

synonyms:

poisonous, mephitic, pestilent, pestilential, toxic, venomous, virulent These adjectives mean having the destructive or fatal effect of a poison: a poisonous snake; a mephitic vapor; a pestilent agitator; pestilential jungle mists; toxic fumes; venomous jealousy; a virulent form of cancer.