known quantity

someone whose character, personality, and behavior are recognized and understood. We need not worry about how John will behave. He is a known quantity. Lisa is a known quantity and I am sure she will not surprise us by voting with the opposition.

Common Names:

Name	Pronounced	Usage
Proserpine	-	Roman Mythology
CİHangİR	-	Turkish
Neculai	-	Romanian
Romolo	RO-mo-lo	Italian
Hyginus	-	Ancient Greek (Latinized)
Malati	-	Indian, Hindi