ma ‧ lig ‧ nant /məˈlɪɡnənt/ BrE AmE adjective
[ Date: 1500-1600 ; Language: Late Latin ; Origin: present participle of malignari ; ⇨ ↑ malign 1 ]
1 . medical a malignant disease is one such as ↑ cancer , which can develop in an uncontrolled way and is likely to cause someone’s death OPP benign :
She developed a malignant tumour in her breast.
2 . formal showing that you hate someone:
a malignant look