ignoramus

The definition of an ignoramus is someone who lacks knowledge or is dumb.

(noun)

An example of an ignoramus is someone who doesn't know their left from their right.

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See ignoramus in Webster's New World College Dictionary

noun pl. ignoramuses

an ignorant and stupid person

Origin: < the name of a lawyer in Geo. Ruggle's play Ignoramus (1615); L, lit., we take no notice (a legal term formerly written on a bill of indictment by a grand jury that finds it to be not a true bill)

See ignoramus in American Heritage Dictionary 4

noun pl. ig·no·ra·mus·es
An ignorant person.

Origin:

Origin: From New Latin ignōrāmus, a grand jury's endorsement upon a bill of indictment when evidence is deemed insufficient to send the case to a trial jury

Origin: , from Latin, we do not know

Origin: , first person pl. present tense of ignōrāre, to be ignorant; see ignore

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