venomous

Short definition from Wiktionary

Adjective

1. 1
   Of an animal (specifically a snake) or parts of its body: producing venom (“a toxin intended for defensive or offensive use”) which is usually injected into an enemy or prey by biting or stinging; hence, of a bite or sting: injecting venom.
2. 2
   Of or pertaining to venom.
3. 3
   Consisting of, or containing or full of, venom or some other poison; hence, harmful to health due to this.
4. 4
   Posing a threat; dangerous, threatening.
5. 5
   Hateful; malignant; spiteful.
6. 6
   Of a weapon such as an arrow or dart: dosed with venom or poison; envenomed, poisoned.
7. 7
   Harmful, hurtful, injurious; specifically, morally or spiritually harmful; evil, noxious, pernicious.