The Open Dictionary

diamond in the rough

noun

UK/ˌdaɪə.mənd ɪn ðə ˈrʌf/
US/ˌdaɪə.mənd ɪn ðə ˈrʌf/

Definitions of diamond in the rough noun

  1. CountableUsually singular

    A person who appears unrefined but possesses admirable qualities and potential.

    • He seemed rough around the edges when he first arrived, but he quickly proved to be a person of admirable character.

    • She might seem unfriendly at first but underneath she is actually a kind, compassionate person.

    • The new recruit needs some guidance, but he is definitely a diamond in the rough.