calumniously
Adverb
Meaning
in a false and slanderous and defamatory manner; with slander or calumny
Source: WordNetSynonyms
slanderously
coarsely
grossly
foully
scandalously
indecently
offensively
disparagingly
abusively
malevolently
injuriously
malignly
harmfully
maliciously
rudely
Show all synonyms