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ignorant (adj.)

late 14c., "lacking wisdom or knowledge; unaware," from Old French ignorant (14c.), from Latin ignorantem (nominative ignorans) "not knowing, ignorant," present participle of ignorare "not to know, to be unacquainted; mistake, misunderstand; take no notice of, pay no attention to," from assimilated form of in- "not, opposite of" (see in- (1)) + Old Latin gnarus "aware, acquainted with" (source also of Classical Latin noscere "to know," notus "known"), from Proto-Latin suffixed form *gno-ro-, suffixed form of PIE root *gno- "to know." Also see uncouth.

Form influenced by related Latin ignotus "unknown, strange, unrecognized, unfamiliar." Colloquial sense of "ill-mannered, uncouth, knowing nothing of good manners" attested by 1886. As a noun, "ignorant person," from mid-15c. Related: Ignorantly.

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Definitions of ignorant from WordNet

ignorant (adj.)
uneducated in general; lacking knowledge or sophistication;
an ignorant man
ignorant (adj.)
uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field;
she is ignorant of quantum mechanics
Synonyms: illiterate
ignorant (adj.)
unaware because of a lack of relevant information or knowledge;
he was completely ignorant of the circumstances
Synonyms: unknowledgeable / unknowing / unwitting
From wordnet.princeton.edu