disposed to cause harm, suffering, or distress deliberately; feeling or showing ill will or hatred.

very dangerous or harmful in influence or effect.

Pathology .

tending to produce death, as bubonic plague.

(of a tumor) characterized by uncontrolled growth; cancerous, invasive, or metastatic.

adjective

benign , harmless , uncancerous

adjective

cancerous , deadly , destructive , fatal , internecine , lethal , mortal , pestilential , poisonous , black , despiteful , evil , hateful , malicious , malign , mean , nasty , spiteful , venomous , vicious , wicked , baneful , noxious , pernicious , pestilent , fiendish , injurious , invidious , rancorous