Read the dictionary definition of stultify. All definitions for this word.
1. deprive of strength or efficiency; make useless or worthless
1. This measure crippled our efforts
2. Their behavior stultified the boss's hard work
2. cause to appear foolish
1. He stultified himself by contradicting himself and being inconsistent
3. prove to be of unsound mind or demonstrate someone's incompetence
1. nobody is legally allowed to stultify himself