WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who is resigned to defeat without offering positive suggestions
n. someone who refuses to do what is asked or does the opposite of what is asked
Word Usage
"Imbued with the righteous moral fervor of a revolutionary, the negativist — to introduce a new literary type — is more persuasive than the encomiast, who tends to resort to the bland, formulaic language of praise."