1560s, in reference to diseases, from Middle French malignant and directly from Late Latin malignantem (nominative malignans) "acting from malice," present participle of malignare "injure maliciously" (see malign (v.)). Earlier in the church malignant "followers of the antichrist," from Latin ecclesiam malignantum in early Church writing, applied by Protestant writers to the Church in Rome (1540s). As an adjective, Middle English used simple malign (early 14c.). Related: Malignantly.
例文
1. She developed a malignant breast tumour.
彼女には悪性の**腫瘍ができている。
2.Alexander got a malignant slander.
アレクサンダーは悪意のある誹謗を受けた。
3.He was died of a malignant tumour.
悪性腫瘍で死亡した。
4.It takes ten years or more for a benign polyp to turn malignant .