Don’t judge a book by its cover is an expression that means you cannot know what something or someone is like by looking only at that person or thing’s appearance.

For example:

This report may look dull, but don’t judge a book by its cover.

I’m glad I didn’t judge a book by its cover, or I never would have married him!

Try not to judge a book by its cover. We’re all guilty of it, especially in a world of Social Media.

You’re not supposed to judge a book by its cover, but that doesn’t stop us from judging one another by our looks.

James had to advise Jane not to judge a book by its cover when she declared she disliked the colour of their new car.

Take it from me. Nancy may look nice and innocent, but the truth is, she’s nothing like that. She has backstabbed her co-workers countless times. She’s a perfect example of never judging a book by its cover.

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