Synonyms for Ignoramus:

n.

joker, clown, numpty, maniac, dumb blond. fool (noun)
dumbbell, dimwit, clod, dullard, bonehead, imbecile, fool, dunce, cretin, bungler, meathead, nincompoop, knuckle-head, dolt, crackpot, chuckle-head, loon, simpleton, lame-brain, dummy, half-wit, nitwit, moron, blockhead.
ignoramus (noun)
buffoon, birdbrain, know nothing, scatterbrain, uneducated person.
person (noun)
know nothing, uneducated person.
simpleton (noun)
imbecile, moron, blockhead, dimwit, fool, dunce.
stupid person (noun)
dolt, dummy, dunce, dumbbell.

Other synonyms:

know-nothing
know nothing.
Other relevant words:
clown, joker, uneducated person.

Usage examples for ignoramus

  1. May I ask- for it's my turn now to play ignoramus may I ask, what noble means excites this gratuitous commendation and surprise? – Tales & Novels, Vol. IX [Contents: Harrington; Thoughts on Bores; Ormond] by Maria Edgeworth
  2. In fact, if I had not succeeded in appearing like a partial ignoramus I should have been obliged to go into a monastery, for in those days the monks were the only people who knew anything. – The Vizier of the Two-Horned Alexander by Frank R. Stockton
  3. 28 Ignoramus the 1st and the 2d. – The Works of Aphra Behn, Vol. I (of 6) by Aphra Behn