Pronunciation: (frus'trāt), [key]
—v., -trat•ed, -trat•ing,
1. to make (plans, efforts, etc.) worthless or of no avail; defeat; nullify: The student's indifference frustrated the teacher's efforts to help him.
2. to disappoint or thwart (a person): a talented woman whom life had frustrated.
to become frustrated: His trouble is that he frustrates much too easily.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.