–verb (used with object), -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.|
This should be a Harry Potter spell EXPECTOPATRONUM! IMPEDIMENTA! STULTIFY!