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ignorant (adj.)

14世纪末, “缺乏智慧或知识; 不知道”, 来自古法语 ignorant (14世纪), 来自拉丁语 ignorantem (名词 ignorans) “不知道, 无知”, ignorare 的现在分词“不知道, 不熟悉; 错误, 误解; 不注意, 不注意”, 来自 in- 的同化形式“不, 相反的” (见 in- (1) ). + 古拉丁语 gnarus “意识到, 熟悉” (也是古典拉丁语 noscere “知道” 的来源, notus “已知” ), 来自普罗拉丁语后缀形式 *gno-ro-, PIE根 *gno- “知道” 的后缀形式. 另见 uncouth.

形式受相关拉丁文 ignotus “未知, 陌生, 不认识, 不熟悉” 的影响. 1886年考证的俗语意义为“没礼貌, 不懂礼貌, 不懂礼貌”. 作为名词, “无知的人”, 从15世纪中期开始相关: 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