Behavior

Be·hav·ior

Behavior

n.
  1. Manner of behaving, whether good or bad; mode of conducting one's self; conduct; deportment; carriage; -- used also of inanimate objects; as, the behavior of a ship in a storm; the behavior of the magnetic needle.
    A gentleman that is very singular in his behavior.

Phrases & Compounds
To be upon one's good behavior
to be in a state of trial, in which something important depends on propriety of conduct.
During good behavior
while (or so long as) one conducts one's self with integrity and fidelity or with propriety.