stultify

Verb
  1. Prove to be of unsound mind or demonstrate someone's incompetence (synset 201805062)
    "nobody is legally allowed to stultify himself"
  2. Cause to appear foolish (synset 200855127)
    "He stultified himself by contradicting himself and being inconsistent"
  3. Deprive of strength or efficiency;
    Make useless or worthless (synset 200226258)
    "This measure crippled our efforts"; "Their behavior stultified the boss's hard work"

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