/ˈɪɡ.nɚ.ənt/
lacking knowledge or information about sth; not educated

an ignorant person/question
无知的人/提问
Never make your students feel ignorant.
千万别让你的学生感到无知。
~ about sth
He’s ignorant about modern technology.
他对现代科技一无所知。
~ of sth
At that time I was ignorant of events going on elsewhere.
那时我并不了解其他地方发生的事情。