C2 not having enough knowledge, understanding, or information about something无知的,愚昧的
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。
UK informal not polite or showing respect无礼的,不敬的
Ignorant lout!没礼貌的混蛋!