you can't judge a book by its cover in Finnish
you can't judge a book by its cover in Finnish
ei ole koiraa karvoihin katsominen
(idiomatic, metaphorical) It is not possible to make reliable judgments about things or people by considering external appearances alone.
moni kakku päältä kaunis
(idiomatic, metaphorical) It is not possible to make reliable judgments about things or people by considering external appearances alone.