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Phrase(s): Beauty is only skin-deep.
Prov. A person who looks beautiful may not have a pleasing personality; a person’s good looks may not last. • Fred: I hope Nancy will go out with me. She’s so beautiful! Jane: I hate to disappoint you, but in Nancy’s case, beauty is definitely only skin-deep. • Don’t be so proud of your pretty face. Beauty is only skindeep.
McGrawhill's American Idioms And Phrasal Verbs