malignant /məˈlɪɡnənt/adjective 2noun 2forms 3 adjective2 •Harmful, malevolent, injurious.[…]while, I fear, there will be some white ones, unable to forget that, with malignant heart, and deceitful speech, they have strove to hinder it. — 1863 •Tending to produce death; threatening a fatal issue. noun2 •A deviant; a person who is hostile or destructive to society.As devout Stephen was carried to his burial by devout men, so is it just and equal that malignants should carry malignants […] — 1823 •(disapproving, no longer used) A person who fought for Charles I in the English Civil War. formsmalignants · more malignant · most malignant