"you can't tell a book by its cover" in español — inglés-español dictionary | Mirar "you can't tell a book by its cover" in inglés

never judge a book by its cover , also: you can't tell a book by its cover
don't judge a book by its cover

proverbio

no juzgues un libro por su portada
She's a very nice person, you shouldn't judge a book by its cover.