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Definition of venomous : 1. Full of venom; noxious to animal life; poisonous; as, the bite of a serpent may be venomous.
2. Having a poison gland or glands for the secretion of venom, as certain serpents and insects.
3. Noxious; mischievous; malignant; spiteful; as, a venomous progeny; a venomous writer.

Synonyms:

hard, monstrous, androgynous, condemnable, asexual, mortal, roughshod, caustic, anthropoid, caged, barbarous, acerb, unpleasant, acid, vitriolic, toxic, fell, deadly, cruel, lethal, deplorable, blistering, envenomed, acrid, inhuman, awful, pernicious, articulate, amphibious, black, sulfurous, arboreal, pestilent, mephitical, bitchy, despiteful, brutal, reprehensible, malign, acerbic, attitude, criminal, uncharitable, aquatic, toxicant, destructive, poison, captive, sulphurous, poisonous, savage, poisoned, best-of-breed, unkind, help, deathly, pitiless, mephitic

black-hearted, ill-natured, hurtful, malicious, hateful, spiteful, evil, malignant, malevolent, perfidious, treacherous, corrosive, virulent, sinister, antagonistic, nasty, catty, wicked, rancorous, churlish, bitter, baleful, sullen, vicious, mean, vindictive, foul, baneful, hostile

Usage examples:

• Instead of attempting to escape with its prize, the rattle- snake, though it could not use its venomous fangs, which would have given it an advantage over its opponent, whose teeth were unprovided with a poison- bag, advanced to the encounter. - "With Axe and Rifle", W.H.G. Kingston.
• The rivers near Escribanos were well stocked with crocodiles, the sea had its fair share of sharks, while on land you too often met with snakes and other venomous reptiles. - "Wonderful Adventures of Mrs. Seacole in Many Lands", Mary Seacole Commentator: W. H. Russell.
• She faced him, and he suspected the venomous glance darted at him through her veil. - "The Sea-Hawk", Raphael Sabatini.