One way to see it: someone acting in a room where a light has never been switched on. They are not stupid — they simply don't have the piece of knowledge everyone assumes they'd have, and it shows in what they say and do.
From the word’s history
From Latin ignōrāns 'not knowing, unaware', the present participle of ignōrāre (in- 'not' + the root of gnōscere 'to know'). The word describes a person in the state of not-knowing — and from there, how that state shows up in their behaviour.
來自拉丁文 ignōrāns（不知道的、沒察覺的），是 ignōrāre 的現在分詞：in-（不）＋ gnōscere（知道）的詞根，經古法文 ignorant 進入英文。它描述的是「處在不知道狀態中的人」——而這個字後來的發展，全都圍繞著那個狀態如何從一個人身上表現出來。
Wiktionary: ignorant < Old French ignorant < Latin ignōrāns ('unaware, unknowing')
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原始詞典資料6 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
ignorantadj/ˈɪɡ.nə.ɹənt/
- 1
Unknowledgeable or uneducated; characterized by ignorance.
- That man that doth not know those things which are of use and necessity for him to know, is but an ignorant man, whatever he may know besides;
- The ignorant peasant, without fault, is greater than the philosopher with many; for what is genius or courage without an heart?
- 2
Not knowing (a fact or facts), unaware (of something).
- For we would not, brethren, have you ignorant of our trouble which came to us in Asia, that we were pressed out of measure, above strength, insomuch that we despaired even of life:
- Eve. Somewhat forbids me, which I cannot name; For ignorant of guilt, I fear not shame: But some restraining thought, I know not why, Tells me, you long should beg, I long deny.
- 3
slangIll-mannered, crude.
- His manner was at best off-hand, at worst totally ignorant.
- 4
obsoleteUnknown; undiscovered
- Alas, what ignorant sin have I committed?
- […] I beseech you, If you know aught which does behove my knowledge Thereof to be inform’d, imprison't not In ignorant concealment.
- 5
Resulting from ignorance; foolish; silly.
- […] his shipping— Poor ignorant baubles!— upon our terrible seas, Like eggshells moved upon their surges, crack’d As easily ’gainst our rocks:
- He had never felt a pain or a sorrow, and did not know what they were, in any really informing way. He had no knowledge of them except theoretically—that is to say, intellectually. And of course that is no good. One can never get any but a loose and ignorant notion of such things except by experience.
ignorantnoun/ˈɪɡ.nə.ɹənt/
- 1
One who is ignorant.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。