calm waters run deep

/kɑːm ˈwɔːtərz rʌn dip/
phrase★Intermediate💡 people who appear quiet or reserved often have profound thoughts or emotions◆proverb

“Don't underestimate her; calm waters run deep.”

She seems quiet, but she has deep wisdom and strong emotions.

◆ What It Really Means
People who appear calm or reserved often have deep thoughts, emotions, or wisdom that are not immediately obvious.
Literal Meaning
Water that appears calm on the surface may actually be very deep.
Literal Breakdown
calm waterswater that appears still or undisturbed+run deepto extend far downward
◇ Mental Image
The image of calm water hiding depth, suggesting that outward appearances can be deceiving.
◈ When to Use
A colleague is quiet in meetings but consistently provides valuable insights. You might say, 'Don't underestimate her; calm waters run deep.'
◉ Cultural Note
This proverb reflects the cultural idea that outward appearances do not always reflect inner qualities.
informal

A proverb suggesting that people who appear calm, quiet, or unassuming often have deep thoughts, emotions, or wisdom that are not immediately obvious.

He never speaks much in meetings, but calm waters run deep—his ideas are always insightful.

He is quiet in meetings, but his contributions are always thoughtful and valuable.

She may seem shy, but calm waters run deep; she has a lot to offer when she opens up.

She appears reserved, but she has deep insights and talents.

💡

This phrase is often used to advise against judging people based on their outward demeanor.

Related Phrases

still waters run deepproverb
A similar proverb with the same meaning.
the quietest people often have the most to sayproverb
A modern variation of the same idea.

💡Pro Tip

Usage Context

Use this phrase when someone is underestimated due to their quiet nature.

⚡Gold Rule

Avoid Misinterpretation

Do not use this phrase to describe literal bodies of water; it is strictly metaphorical.

📖Word Origin

The phrase originates from the observation that calm or still water often hides depth, suggesting that outward appearances can be deceiving.

📝Usage Notes

This phrase is commonly used to describe people who are introverted or reserved but possess deep intelligence, wisdom, or emotional depth.

English Dictionary