n pl , -muses an ignorant person; fool
(C16: from legal Latin, literally: we have no knowledge of, from Latin ignorare to be ignorant of; see ignore; modern usage originated from the use of Ignoramus as the name of an unlettered lawyer in a play by G. Ruggle, 17th-century English dramatist)
English Collins Dictionary - English Definition & Thesaurus
ass, blockhead, bonehead (slang) dolt, donkey, duffer (informal) dullard, dunce, fathead (informal) fool, illiterate, lowbrow, numbskull or numskull, numpty (Scot. informal) simpleton
English Collins Dictionary - English synonyms & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"