To maintain one's purity and integrity but remain unacknowledged or unused, similar to a clean well that is not drunk from; to uphold high moral standards while being overlooked.
他一生正直，洁身自好，虽才华横溢却不喜张扬，真可谓井渫不食。
He lived a life of integrity, maintaining his purity and self-respect, and though very talented, he disliked showing off, truly like a clean well that no one drinks from.
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