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ignorant 
1  adj If you describe someone as ignorant, you mean that they do not know things they should know. If someone is ignorant of  a fact, they do not know it. 
oft ADJ of/about n 
People don't like to ask questions for fear of appearing ignorant...  
2  adj People are sometimes described as ignorant when they do something that is not polite or kind. Some people think that it is not correct to use ignorant with this meaning.