a.

1. 有惡意的，邪惡的
   a malignant nature

   邪惡的本性

2. 極有害的
3. 【醫】惡性的，致命的
   A cancer is a malignant growth.

   癌是一種惡性贅生物。

n.

1. 不滿者[C]

adj.

1. evil; malevolent.
2. (of a tumour) tending to invade normal tissue or to recur after removal; cancerous. Contrasted with benign.