Etymology
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stultify (v.)

1766, "allege to be of unsound mind" (legal term), from Late Latin stultificare "turn into foolishness," from Latin stultus "foolish" (literally "uneducated, unmovable," from suffixed form of PIE root *stel- "to put, stand, put in order," with derivatives referring to a standing object or place) + combining form of facere "to make, to do" (from PIE root *dhe- "to set, put"). The first element is cognate with Latin stolidus "slow, dull, obtuse" (see stolid). Meaning "cause to appear foolish or absurd" is from 1809. Hence stultiloquy "foolish talk, silly babbling" (1650s). Related: Stultified; stultifying.

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Definitions of stultify

stultify (v.)
prove to be of unsound mind or demonstrate someone's incompetence;
nobody is legally allowed to stultify himself
stultify (v.)
cause to appear foolish;
He stultified himself by contradicting himself and being inconsistent
stultify (v.)
deprive of strength or efficiency; make useless or worthless;
Their behavior stultified the boss's hard work
Synonyms: cripple
From wordnet.princeton.edu