run deep Thành ngữ, tục ngữ
Still waters run deep.
A quiet person can have much knowledge or wisdom.
Still waters run deep
People use this idiom to imply that people who are quiet and don't try to attract attention are often more interesting than people who do try to get attention.
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Quiet people probably are profound thinkers.

A proverb.
He doesn't say much, but he sure looks smart. Well, still waters run deep, isn't that true?run deep
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