Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
venomous [ˈvɛnəməs] adj (snake, insect) ядови́тый/ядови́т (look, stare) зло́бный*зло́бен
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: