Can anybody define 'vacant' as it would describe a person?
How to Describe a Person's Physical Appearance
Society gives us a pre-defined definition and a sort of vague idea of what most labels represent. For instance, if you labeled person A, then used that label to describe person A to person B, you'd immediately be giving person B a vague idea of what person A is like.
How to Describe a Person | Using Descriptive Words
Well, I would like you to use adjective "Impudent" to describe person with rude behavior. Moreover, it's not offensive at all and you can use it in different situations. For example
To write a descriptive essay, you’ll need to describe a person, object, or event so vividly that the reader feels like he/she could reach out and touch it.A term to describe person, who is usually a non-transgender, that is sexually attracted to transgender people. See also Transfan, Tranny Chaser and Transamorous.