Synonyms of impugnment

2 Syllables
blame, slander, libel
3 Syllables
factiousness, calumny, aggression, censure, criticism, abuse, defiance
4 Syllables
pugnacity, denunciation, denigration
5 Syllables
indocility, belligerence, combativeness, vilification, recalcitrance
6 Syllables
intractability