Definition of malignant :
1. A man of extrems enmity or evil intentions.
2. Characterized or caused by evil intentions; pernicious.
3. Disposed to do harm, inflict suffering, or cause distress; actuated by extreme malevolence or enmity; virulently inimical; bent on evil; malicious.
4. One of the adherents of Charles L. or Charles LL.; - so called by the opposite party.
5. Tending to produce death; threatening a fatal issue; virulent; as, malignant diphtheria.
harmful (part of speech: adjective)
unhealthy (part of speech: adjective)
malevolent (part of speech: adjective)
black-hearted, ill-natured, hurtful, malicious, hateful, sullen, evil, mean, malevolent, rancorous, venomous, corrosive, virulent, spiteful, antagonistic, perfidious, catty, wicked, sinister, churlish, bitter, baleful, treacherous, vicious, nasty, vindictive, foul, baneful, hostile
diseased (part of speech: adjective)
- In any case, could malignant fortune have posted, at this place and hour, a more dangerous watcher? - "The Room in the Dragon Volant", J. Sheridan LeFanu.
- Then all the sky grew dark, and from the land Malignant terrors drove me shrieking forth; And as I fled, my youth abandoned me; My hair turned gray, my shoulders stooped, my blood Grew colder, and my perfect form was changed. - "Stories in Verse", Henry Abbey.
- There was comfort in the thought that they were not active and malignant in their enmity. - "The Lost Trail", Edward S. Ellis.