"Dullard" is a word used to describe someone who is slow or lacking intelligence. It refers to a person who is dull-witted or not very smart. Full definition
WALL STREET JOURNAL — Feb 15 — Among the 125 million people in the U.S. who visit online dating and social - networking sites are a growing number of dullards who steal personal profiles, life philosophies, even signature poems. (onlinepersonalswatch.com)
I heard him the other night on the radio and after a few hours at Mike Bloomberg's knee, he has the clipped voice and the general air of a multi-billionaire instead of dullard who has spent most of his life sucking on the public teat. (jonathanpelto.com)
There, we are led to believe, teachers will be caring and highly skilled (unlike the lazy dullards in public schools); the schools will have high expectations and test scores will soar; and all children will succeed academically, regardless of their circumstances. (nybooks.com)