Question

Still Waters Run Deep somebody can be more knowledgeable or emotional than he or she first appears to be; a silent person may be intelligent

Accepted Answer

Antonia was a quiet student, but she was also brilliant. Still waters run deep. This English proverb has been used since the 15th century. It's similar to expressions that have been used by people in other countries and that date back to the ancient Romans. It's based on a fact of nature: The shallow water in a river runs fast but deep water is usually calmer. This expression is sometimes applied to quiet people who you think are safe, but who may be dangerous plotters, spies, and saboteurs.

Idiom	Still Waters Run Deep
Example	Antonia was a quiet student, but she was also brilliant. Still waters run deep.
Meaning	somebody can be more knowledgeable or emotional than he or she first appears to be; a silent person may be intelligent
Origin	This English proverb has been used since the 15th century. It's similar to expressions that have been used by people in other countries and that date back to the ancient Romans. It's based on a fact of nature: The shallow water in a river runs fast but deep water is usually calmer. This expression is sometimes applied to quiet people who you think are safe, but who may be dangerous plotters, spies, and saboteurs.

Deep Waters Run Quiet People Antonia Student Brilliant