For a long time there had been rumours — circulated, he had reason to think, by some malignant enemy — that there was something subversive and even revolutionary in the outlook of himself and his colleagues.
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.