People don't like to ask questions for fear of appearing ignorant.

人们不喜欢问问题,害怕自己会显得很无知。

Many people are worryingly ignorant of the facts about global warming.

许多人竟然不知道地球变暖的事实,实在令人担忧。

...ignorant peasants.

愚昧无知的农民

I met some very ignorant people who called me all kinds of names.

我碰到了一些非常粗鲁的家伙,他们用各种脏话骂我。