[ig-nuh-rey-muhs, -ram-uhs]
noun, plural ignoramuses.
an extremely ignorant person.

1570–80; < Latin ignōrāmus we ignore (1st person plural present indicative of ignōrāre to be ignorant of, ignore); hence name of an ignorant lawyer in the play Ignoramus (1615) by the English playwright G. Ruggle, whence current sense

simpleton, fool, dunce, know-nothing.
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World English Dictionary
ignoramus (ˌɪɡnəˈreɪməs)
n , pl -muses
an ignorant person; fool
[C16: from legal Latin, literally: we have no knowledge of, from Latin ignōrāre 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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1577, Anglo-Fr. legal term, from L. ignoramus "we do not know," first person present indicative of ignorare "not to know" (see ignorant). The legal term was one a grand jury could write on a bill when it considered the prosecution's evidence insufficient. Sense of "ignorant
person" came from the title role of George Ruggle's 1615 play satirizing the ignorance of common lawyers.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In the land of subtle savors, my tongue is an ignoramus.
For someone who claimed to be mixed race, you are about as much of a white ignoramus as they come.
Education is one of those things where every ignoramus and his brother is an expert.
Only an ignoramus or a fool could arrive at this conclusion.
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