Harmfully cancerous; as a malignant tumor. (adjective)
Examples of word malignant
_malignant_ and _poisonous_ affections, as scirrhus and other varieties of cancer, and also cases of infectious virus, demand continually, or with but occasional exceptions, the primary galvanic current A B. ☞ In treating these malignant affections, the current should be run through as short a distance of _healthy_ tissue as possible, yet so as fairly to reach the diseased part.
The term malignant is used in describing cancerous tumors (see cancer) because such growths are a threat to the health of the individual.
Congressman Foley is the poster child for what we call malignant narcissism.
Sure, there was that initial rush of anxiety at hearing the word "malignant" for the first time, but it was already disappearing by the time I got off the phone with the surgeon.
APL is characterized by the malignant proliferation of these immature promyelocytes.