still waters run deep . still waters run deep 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? Categories: add yours proverbs Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: S Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Add my comment