An open book Meaning in English
expression
Definition
If a person is 'an open book,' it means they are honest and easy to understand, showing their thoughts or feelings openly. The expression can also describe something that is simple and clear.
Usage & Nuances
This expression is mostly informal. It is commonly used to describe people who do not hide their emotions or intentions, but it can also be used for things that are transparent or obvious. Don't use it for someone who is secretive or mysterious.
Example Sentences
My sister is an open book; she always tells me how she feels.
basic
He is an open book when it comes to his opinions.
basic
This math problem is an open book for me.
basic
You can't hide anything from her—she's an open book.
natural
Unlike his brother, Mark is an open book—he never has secrets.
natural
With some people, you never know what they're thinking, but Anna is an open book.
natural