malignant
ma·lig·nant
adj \mə-ˈlig-nənt\Definition of MALIGNANT
1
: tending to produce death or deterioration <malignant malaria>; especially : tending to infiltrate, metastasize, and terminate fatally <malignant tumors>—compare benign 1
2
: of unfavorable prognosis : not responding favorably to treatment <psychotic reactions with a malignant trend>
Learn More About
Seen & Heard 
What made you want to look up malignant? Please tell us where you read or heard it (including the quote, if possible).
