ignoramus ( ignoramuses plural ) If you describe someone as an ignoramus, you are being critical of them because they do not have the knowledge you think they ought to have.
Translation English Cobuild Collins Dictionary
ass, blockhead, bonehead (slang) dolt, donkey, duffer (informal) dullard, dunce, fathead (informal) fool, illiterate, lowbrow, numbskull or numskull, numpty (Scot. informal) simpleton
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"