A malignant tumour or disease is out of control and likely to cause death.
例句
She developed a malignant breast tumour.她長(zhǎng)了一個(gè)惡性的乳房腫瘤。
ADJ-GRADED
（人）惡意的，惡毒的
If you say that someone is malignant, you think they are cruel and like to cause harm.
例句
He said that we were evil, malignant and mean.他說我們既邪惡又惡毒，還非常卑鄙。...a community overrun by a malignant minority indulging in crime and violence.一小撮從事違法和暴力活動(dòng)的壞人橫行無忌的社會(huì)
英漢詞典釋義
adj.
惡毒的, 極想傷害他人的
Alexander got a malignant slander.亞歷山大受到惡意的誹謗。
(疾病)惡性的; 極危險(xiǎn)的; 致命的
He was died of a malignant tumour.他死于惡性腫瘤。
英英詞典釋義
Adjective
1. dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor)