malignant
//məˈlɪɡnənt//
Adjective
malignantCanonical form
1
(Of a disease or tumor) very dangerous and likely to cause death; tending to spread uncontrollably in the body.
The biopsy revealed a malignant tumor that required immediate treatment.
2
Having or showing a strong desire to harm others; deeply malevolent or spiteful.
She gave him a malignant look full of hatred.