They are ignorant.

出自-2016年6月阅读原文

People aren't kidding when they say they love their dog or their dog loves them, but were rather ignorant about the nature of the relationships that form between dogs.

2019年12月四级真题（第二套）听力 Section C

We allow them to be left around because we've been ignorant of their value.

2017年高考英语浙江卷（11月） 阅读理解 阅读C 原文

Court, school organizations of amateurs, and the traveling actors were all rivals in supplying a widespread desire for dramatic entertainment; and no boy who went a grammar school could be ignorant that the drama was a form of literature which gave glory to Greece and Rome and might yet bring honor to England.

出自-2018年考研翻译原文

You can call their views stupid, or joke about how ignorant they are.

2020年考研真题（英语一）翻译 Section Ⅲ