backbiter

The widow was no gossip, no backbiter, but a woman of opinions and a nimble tongue undeterred by fear or favor.

I know thee for a liar, a deceiver, a backbiter, and a spirit of insatiable malevolence.

The flatterer, the backbiter, the spy,—these find here a rich soil.

Would the slanderer, or backbiter, or hypocrite, indulge their habits if they realized this truth?

Here is something to confute the old backbiter,' and he clapped with his thick short hand a heavy leather pocket-book.