/ ˌɪgnəˈreɪməs; NAmE / noun
(usually humorous ) a person who does not have much knowledge :
When it comes to music, I'm a complete ignoramus.
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WORD ORIGIN
late 16th cent. (as the endorsement made by a grand jury on an accusation / claim considered backed by insufficient evidence to bring before a petty jury): Latin , literally we do not know (in legal use we take no notice of it), from ignorare not know, ignore, from in- not + gno- , a base meaning know. The modern sense may derive from the name of a character in George Ruggle's Ignoramus (1615), a satirical comedy exposing lawyers' ignorance.