Closed book

Someone who doesn't say much about themselves, no one really knows anything about their past, hobbies, or likes/dislikes.
A closed book is sometimes mistakenly defined as someone with "trust issues".

Person 1: How much do you know about her?
Person 2: Not much. She's a closed book, so she doesn't share much about her.

Closed book by Cynedia August 8, 2016

closed book

Any woman/girl who acts in a way that makes her difficult to figure out or understand.

I really like this chick, but she's like a closed book to me.

closed book by SlangTwang January 20, 2009

closed book

a guy/girl who doesn't let anyone read them or cant let anyone read them. possibly thought their ex was 'the one' and went over a bad breakup and left thinking they were the best they ever had.

Mike: Dude I dig her but she's a closed book.
Joe: Forget about it man her loss, there's other fish in the sea.

closed book by johnnyplaylax July 3, 2010

close the book 

IN BRIEF: Ask for a divorce or an ending to a relationship; See end the book.

Sometimes two people are not on the same page to a point where he/she is turning too many more pages than him/her to where he/she wants to close the book.

close the book by Mr. Terrence L. Trezvant March 31, 2009