Malignant

1. Disposed to do harm, inflict suffering, or cause distress; actuated by extreme malevolence or enmity; virulently inimical; bent on evil; malicious.
2. Tending to produce death; threatening a fatal issue; virulent; as, malignant diphtheria.
3. A man of extrems enmity or evil intentions.
4. One of the adherents of Charles L. or Charles LL.; -- so called by the opposite party.
5. Characterized or caused by evil intentions; pernicious.