Difference between Stupid Person and Dullard

STUPID PERSON vs DULLARD: NOUN

Nidget, Idiotize, Saphead, Idiotic, Idiot, Young person, Idioted, Nitwitted, Idiotish, Pudding head, Pudden head, Poor fish, Dullard, Dolt, Stupid

Ignoramus, Buffoon, Moron, Dunderhead, Simpleton, Nincompoop, Dimwit, Veriest, Stupid person, Pudding head, Pudden head, Poor fish, Bore, Stupid, Dolt

Morosoph, Moronic, Glaikit, Nidget, Idiotize, Saphead, Idiotic, Idiot, Young person, Idioted, Nitwitted, Idiotish, Dullard, Dolt, Stupid

Oaf, Nitwit, Doofus, Ignoramus, Buffoon, Moron, Dunderhead, Simpleton, Nincompoop, Dimwit, Veriest, Stupid person, Bore, Stupid, Dolt

And, yes, I rather be a stupid person wanting clarification and answers, in order to be wiser, than one that blindly believes without question.
Mujuru is very close now to even be president of mdc.strategy. This Lumumba chap is the most stupid person i have ever known.
LIGHTS, a worthless piece of meat, applied metaphorically to a fool, a soft or stupid person.
That letter is a practical joke dispatched by some stupid person who has nothing to do with this business.
Another year has passed and you are still the stupid person you have always been.
The boss will not be the only stupid person you encounter in life.
Ever talked to a good looking stupid person and lost all respect for them?
The original Hebrew word can mean an unshaped form or figuratively a stupid person.
Git is British slang for an unpleasant or stupid person.
This is a stupid argument written by a stupid person.

He is a dullard, he is slow, he does not say intelligent things, he does not have clear thoughts.
So a simpleton could be considered a hillbilly or yokel as well as a dullard or dunce.
The wisdom of a million fools in the diction of a dullard.
The error, when pointed out, is so obvious, that it must be at once corrected, to the conviction of the merest dullard.
This dullard has done this to me twice and now I have stuff shipped Fedex to the office.
Subject: Re: man is dull Summary: But is Poundstone a dullard?
He was expelled from his first school as a dullard.