The Collaborative International Dictionary
Calumniatory
Calumniatory \Ca*lum"ni*a*to*ry\, a.
Containing calumny; slanderous.
--Montagu.
Wiktionary
calumniatory
a. Containing calumny; slanderous.
WordNet
calumniatory
adj. (used of statements) harmful and often untrue; tending to discredit or malign [syn: calumnious, defamatory, denigrative, denigrating, denigratory, libellous, libelous, slanderous]