Still waters run deep

Meaning: Quiet people often have great depth of character.

Origin: The Roman historian Quintus Curtius Rufus observed that the deepest rivers flow with the least sound. English has the idea from the Middle Ages, and Shakespeare's Henry VI, Part 2 has "Smooth runs the water where the brook is deep." A quiet person may hide strong feelings or great knowledge.

Equivalents in French, Spanish, Japanese, and German

  • French: Il n'est pire eau que l'eau qui dort (literally: There is no worse water than sleeping water)
  • Spanish: Del agua mansa líbreme Dios (literally: God save me from still water)
  • Japanese: 能ある鷹は爪を隠す (Nō aru taka wa tsume wo kakusu) (literally: A talented hawk hides its talons)
  • German: Stille Wasser sind tief (literally: Still waters are deep)

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