“Still waters run deep”: meaning, origin and examples

What it means
The phrase still waters run deep suggests that people who are quiet or reserved may have deep and complex thoughts or emotions beneath the surface.
Tone The tone of the phrase is often thoughtful, contemplative, or sometimes cautionary, suggesting that there is more to someone than meets the eye.
Where it comes from
The phrase is believed to have originated from the Latin saying altissima quaeque flumina minimo sono labi, meaning “the deepest rivers flow with the least sound.” It has been used in English since at least the 16th century.
Examples
- Though Sarah doesn’t say much in meetings, her still waters run deep; she’s full of great ideas when you take the time to ask.
- Don’t underestimate him because he seems quiet—remember, still waters run deep.
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