To make foolish; to make a fool of; as, to stultify one by imposition; to stultify one's self by silly reasoning or conduct.

To regard as a fool, or as foolish.

To allege or prove to be of unsound mind, so that the performance of some act may be avoided.

deprive of strength or efficiency; make useless or worthless; "This measure crippled our efforts"; "Their behavior stultified the boss's hard work"