malignant

(a) dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor)

Antonyms

benign

Words of close approximity

malignant anaemia malignant anemia malignant hepatoma malignant hypertension malignant hyperthermia malignantly malignant melanoma malignant neoplasm malignant neoplastic disease malignant neuroma malignant pustule malignant tumor