The action of slandering a person without that person's knowledge.
Slanderous or speaking badly, especially of a person without that person's knowledge.
One who makes specious arguments; one who is disputatious.
A type of dialogue or argument where the participants do not have any reasonable goal. The aim is to argue for the sake of conflict, and often to see who can yell the loudest.
Provoking strife, controversy or discord.