not judge a book by its cover

not judge a book by its cover

To not judge the true qualities or characteristics of someone or something just by assessing superficial details alone. His leather jacket made him seem like a bit of a jerk to me, but I guess you shouldn't judge a book by its cover. I know she dresses a little frumpy, but don't judge a book by its cover, man!
See also: book, by, cover, judge, not
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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