diamond in the rough

The idiom "diamond in the rough" refers to someone or something with hidden potential or value that is not immediately apparent.

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Definition

(figurative)Someone with great potential or talent but who lacks refinement or polish.

Despite his unpolished manners, everyone could see he was a diamond in the rough.

(figurative)Something valuable that is in poor condition but can be improved with effort.

The old house was a diamond in the rough, needing only a bit of renovation to become a beautiful home.

Terms that have similar or relatively close meanings to "diamond in the rough":