detractor (part of speech: noun)
The flatterer, the backbiter,
the spy,- these find here a rich soil.
- "Prison Memoirs of an Anarchist", Alexander Berkman.
Was it true, as Courtenay thinks, that jealousy of King William's attachment to Temple disturbed the episcopal equipoise of soul, rendering his Lordship slanderous, even a backbiter?
- "The-Love-Letters-of-Dorothy-Osborne-to-Sir-William-Temple-1652-54", Osborne, Dorothy.