D defs.my
Entry 3 senses Webster, 1913

Stultify

/stŭl'-təf-īˌ/ · Stul·ti·fy · IPA /ˈstʌltɪfaɪ/
01 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.
imp. & p. p. Stultified; p. pr. & vb. n. Stultifying
  1. 1.
    To make foolish; to make a fool of; as, to stultify one by imposition; to stultify one's self by silly reasoning or conduct.
  2. 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.” — Hazlitt.
  3. 3.
    To allege or prove to be of unsound mind, so that the performance of some act may be avoided.(Law)