# still waters run deep

> English word · Proverb

## Definitions
1. A person with a calm appearance has, or may have, considerable inner emotion, character, or intellect.

## Etymology
Of Latin origin, but possibly popularized by William Shakespeare, c. 1590, in "Henry VI," part 2, act 3, scene 1:
: Smooth runs the water where the brook is deep;
: And in his simple show he harbours treason.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/still-waters-run-deep