calumniator

Often one serious word will suffice to silence a calumniator of the Faith and cause him to blush.

If anyone, thereafter, dares accuse you of having had a son before your marriage, treat him as a vile calumniator.

I shall charitably suppose that some infamous calumniator has belied me to you.

As he had fled, and did not appear to answer the summons, he had been expelled from the University as a traitor and calumniator.

It is well known that the said calumniator did, at many periods of his life, make use of the services of a calceolarius.