Pronunciation: (stul'tu-fī"), [key]
—v.t., -fied, -fy•ing.
1. to make, or cause to appear, foolish or ridiculous.
2. to render absurdly or wholly futile or ineffectual, esp. by degrading or frustrating means: Menial work can stultify the mind.
3. Law.to allege or prove (oneself or another) to be of unsound mind.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.