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The Collaborative International Dictionary
malignify

malignify \ma*lig"ni*fy\, v. t. [imp. & p. p. Malignified; p. pr. & vb. n. Malignifying.] [L. malignus malign + -fy.] To make malign or malignant. [R.] ``A strong faith malignified.''
--Southey.

Wiktionary
malignify

vb. (context transitive English) To make malign or malignant.