Webster's English Dictionary

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malignant

1. ma.lig.nant \m*-'lig-n*nt\ aj [LL malignant-, malignans, prp. of 
   malignari] obs  1a: DISAFFECTED, MALCONTENT  1b: evil in nature, influence, 
   or effect : INJURIOUS  1c: extremely malevolent or malicious  2: tending to 
   produce death or deterioration {~ malaria}; esp  : tending to infiltrate, 
   metastasize, and terminate fatally {~ tumor} - ma.lig.nant.ly av
2. malignant n archaic  : MALCONTENT