The Collaborative International Dictionary of English v.0.48:
Stultify \Stul"ti*fy\, v. t. [imp. & p. p. Stultified; p. pr.
& vb. n. Stultifying.] [L. stultus foolish + -fy.]
1. To make foolish; to make a fool of; as, to stultify one by
imposition; to stultify one's self by silly reasoning or
2. To regard as a fool, or as foolish. [R.]
The modern sciolist stultifies all understanding but
his own, and that which he conceives like his own.
3. (Law) To allege or prove to be of unsound mind, so that
the performance of some act may be avoided.