a remark that disparages, maligns, or slanders another.
synonyms: insult, slander, libel
antonyms: approval, compliment, kindness
Jack’s political rival cast an aspersion against him right before the election.
Because I know Janice is a kind person, I cannot believe the negative aspersion about her.
Bush Called Out On UK News: Idiot Calls Truth: 'SLANDER'!