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malignant

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malignant/məˈlɪgnənt/adjective
malignant
/məˈlɪgnənt/
adjective
Learner's definition of MALIGNANT  
[more malignant; most malignant]
medical  : very serious and dangerous : tending or likely to grow and spread in a rapid and uncontrolled way that can cause death
— opposite benign
formal  : very evil

— malignantly

adverb
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