stultified

/S T AH1 L T AH0 F AY0 D/
verb
  1. 1

    To prove to be of unsound mind or demonstrate someone's incompetence.

  2. 2

    To cause to appear foolish.

  3. 3

    To deprive of strength or efficacy; make useless or worthless.

Synonyms

Source: https://en.wiktionary.org/wiki/stultified, https://en.wiktionary.org/wiki/stultify