Disposed to do harm, inflict suffering, or cause distress; actuated by extreme malevolence or enmity; virulently inimical; bent on evil; malicious.
- Showing great malevolence; disposed to do evil.
- Highly injurious; pernicious.
- Pathology Threatening to life; virulent: a malignant disease.
- Pathology Tending to metastasize; cancerous. Used of a tumor.