Synonyms of bad-mouthing

1 Syllable
knock, roast, pan, rip, slam, dis, rap
2 Syllables
hosing, slander, mudsling, malign
3 Syllables
reviling, belittle, quinine
4 Syllables
revilement, disparage, scurrilousness, criticize
5 Syllables
minimization, minimizations, vituperation