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3 definitions found
 for poisonous
From The Collaborative International Dictionary of English v.0.48 :

  Poisonous \Poi"son*ous\, a.
     Having the qualities or effects of poison; venomous; baneful;
     corrupting; noxious. --Shak. -- Poi"son*ous*ly, adv. --
     Poi"son*ous*ness, n.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adj 1: having the qualities or effects of a poison [syn:
             poisonous, toxicant]
      2: not safe to eat
      3: marked by deep ill will; deliberately harmful; "poisonous
         hate"; "venomous criticism"; "vicious gossip" [syn:
         poisonous, venomous, vicious]

From Moby Thesaurus II by Grady Ward, 1.0 :

  90 Moby Thesaurus words for "poisonous":
     bad, baleful, baneful, barfy, brackish, catching, cloying,
     communicable, contagious, corroding, corrosive, corrupting,
     corruptive, counterproductive, damaging, dangerous, deadly,
     defamatory, deleterious, destructive, detrimental, diabolical,
     disadvantageous, disserviceable, distressing, envenomed, evil,
     fatal, fetid, foul, fulsome, harmful, high, hurtful, icky,
     infectious, infective, injurious, lethal, maggoty, malefic,
     malevolent, malicious, malign, malignant, mawkish, mephitic,
     miasmal, miasmatic, miasmic, mischievous, mortal, nasty, nauseant,
     nauseating, nauseous, noisome, noxious, offensive, ominous,
     overripe, pernicious, pestiferous, pestilent, pestilential, poison,
     prejudicial, rancid, rank, rebarbative, rotten, scatheful, septic,
     sickening, slanderous, spoiled, stinking, toxic, toxicant,
     toxiferous, venenate, veneniferous, venenous, venomous, vicious,
     vile, virulent, vomity, weevily, yucky

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