Back-bitten, past participle of back-bite. Synonyms in the same form.
Stab
stabbed, slandered, lampooned, defamed, libeled, maligned, blackened, vilified, disparaged, denigrated, reviled, stained, smeared, discredited, detracted, disgraced, tarnished, sullied, blotted, blemished, scandalized
Other
bitched
All synonyms for back-bite →