the GNU version of the Collaborative International Dictionary of English
n. A stupid person; a dunce.
The Century Dictionary and Cyclopedia
n. A dull or stupid person; a dolt; a blockhead; a dunce.
Dull; doltish; stupid.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person who evokes boredom
n. a person who is not very bright
Word Usage
"Thus, a fellow with a low forehead and a weakly receding chin, Kerry classified as a dullard, a witling, unaware that if the brow were but low enough and the chin virtually absent altogether he might stand in the presence of a second Daniel."