not having enough knowledge, understanding, or information about something

Many teenagers are surprisingly ignorant about current politics. 许多青少年对时事政治表现出惊人的无知。

We remained blissfully ignorant of the troubles that lay ahead. 我们对将要出现的麻烦一无所知，这或许是一种幸运。

Synonyms: benighted clueless illiterate unenlighteneduninformed

not polite or showing respect

Ignorant lout! 没礼貌的混蛋！