Quiet waters run the deepest.
A person who is usually quiet and works or manages their business modestly and without excessive noise may be very wise, as well as two-faced.
Still [stil]:
Quiet, calm, peaceful, motionless, stagnant, silent, subdued, quieted.
Water ['wɔ:tə]:
Water.
Run [rʌn]:
Run, sprint, race, flow out, dash, cover (distance), escape, flee.
Flow, pour.
Deep [dēp]:
Deep, dark, hidden, impassable (of a path).
(At a) deep level.
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