stultifying

(transitive) To stunt, inhibit (progress, ideas, etc.) or make dull and uninteresting, especially through routine that is overly restrictive or limiting.
(dated, transitive) To make useless or worthless.
(dated, transitive) To cause to appear foolish; to deprive of strength; to stupefy.
(archaic, transitive) To prove to be of unsound mind or demonstrate someone's incompetence.