Source : Webster's Revised Unabridged Dictionary (1913)

Dullard \Dull"ard\, n. [Dull + -ard.]
   A stupid person; a dunce. --Shak. -- a. Stupid. --Bp. Hall.

Source : WordNet®

dullard
     n 1: a person who is not very bright; "The economy, stupid!"
          [syn: {stupid}, {stupid person}, {dolt}, {pudding head},
           {pudden-head}, {poor fish}, {pillock}]
     2: a person who evokes boredom [syn: {bore}]