1) Cause to appear foolish 2) Demonstrate 3) Establish 4) Make useless or worthless 5) Prove 6) Shew 7) Show 8) Thwart 9) To cause to appear foolish 
• (v. t.) To make foolish; to make a fool of; as, to stultify one by imposition; to stultify one`s self by silly reasoning or conduct. • (v. t.) To regard as a fool, or as foolish. • (v. t.) To allege or prove to be of unsound mind, so that the performance of some act may be avoided.
Stul'ti·fy transitive verb [ imperfect & past participle Stultified ; present participle & verbal noun Stultifying .] [ Latin stultus foolish + -fy .] 1. To make foolish; to make a fool of; as, to stultify ...
[v] - prove to be of unsound mind or demonstrate someone`s incompetence 2. [v] - cause to appear foolish
to make, or cause to appear, foolish or ridiculous. · to render absurdly or wholly futile or ineffectual, esp. by degrading or frustrating means: Menial work can stultify the mind. · to allege or prove (oneself or another) to be of unsound mind.
[SAT terms] deprive of strength or efficiency; make useless or worthless deprive of strength or efficiency; make useless or worthless[Intelligent words] deprive of strength or efficiency; make useless or worthless
deprive of strength or efficiency; make useless or worthless