Malignantly adv. : In a malignant manner.

Example:
What would be the reason why someone would be Malignantly obsessed with someone yet want to destroy them?

Taxonomy
dictionary, Encyclopedia, malignant, malignant tumor, thesaurus browser, online dictionary, lig, nant, Translations, Free Online Dictionary, tumor, synonyms, antonyms, eyes, theileriasis, English dictionary, malignant disease, malignity.

Defination from the web:
malignantly in the Online Dictionary. Meaning of malignantly. Pronunciation of malignantly. Translations of malignantly. ... "That, anyway," said Nikolay Levin, with an ironical smile, his eyes flashing malignantly, "has the charm of--what's one to call it? ...