Adjective poisonous has 3 senses
  1. poisonous, toxicant - having the qualities or effects of a poison
    Antonyms: nontoxic, atoxic (indirect, via toxic)
  2. poisonous - not safe to eat
    Antonyms:
    edible, comestible, eatable (indirect, via inedible)
  3. poisonous, venomous, vicious - marked by deep ill will; deliberately harmful; "a malevolent lie"; "poisonous hate...in his eyes"- Ernest Hemingway; "venomous criticism"; "vicious gossip"
    Antonyms: benevolent, good (indirect, via malevolent)
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