a.

1. 有恶意的，邪恶的
   a malignant nature

   邪恶的本性

2. 极有害的
3. 【医】恶性的，致命的
   A cancer is a malignant growth.

   癌是一种恶性赘生物。

n.

1. 不满者[C]

adj.

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