mis•be•havePronunciation: (mis"bi-hāv'), [key]
—v., -haved, -hav•ing.
to behave badly or improperly: The children misbehaved during our visit.
to conduct (oneself) without regard for good manners or accepted moral standards: Several of the guests misbehaved themselves.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.