the GNU version of the Collaborative International Dictionary of English
adj. Containing calumny; slanderous.
The Century Dictionary and Cyclopedia
Slanderous: as, “calumniatory information,”
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. (used of statements) harmful and often untrue; tending to discredit or malign
Word Usage
"He must divert their sympathy for Ray into distrust of him, and before he had fully considered his words they were spoken, -- crafty, insidious, and calumniatory."