1) to speak ill of, often falsely
malign extol, laud, benevolent, charitable
charitable : malign
They maligned her academic record with false reports of her cheating.
Synonyms: defame, misrepresent, slander
(v.; adj.) to speak evil of; having an evil disposition toward others (opposite: benign)
In her statement to the judge she maligned her soon-to-be ex-husband.
She had such a malign personality that no one even tried to approach her, mostly out of fear.