From that day, as the doctor expressed it, the wasting fever assumed a malignant character, but what the doctor said did not interest Natasha, she saw the terrible moral symptoms which to her were more convincing.
Who asked you to?" shouted Natasha, raising herself on the sofa and looking malignantly at Marya Dmitrievna.
There are no more uses of "malignant" in the book.
Show samples from other sources
Gey and his wife, Margaret, had spent the last three decades working to grow malignant cells outside the body, hoping to use them to find cancer’s cause and cure.
Rebecca Skloot -- The Immortal Life of Henrietta Lacks
He hit it [the shark] without hope but with resolution and complete malignancy.