Pronunciation: (mu-lig'nunt),[key] —adj. 1. disposed to cause harm, suffering, or distress deliberately; feeling or showing ill will or hatred.
2. very dangerous or harmful in influence or effect.
3. Pathol. a. tending to produce death, as bubonic plague.
b. (of a tumor) characterized by uncontrolled growth; cancerous, invasive, or metastatic.