To allege or prove to be of unsound mind and hence not responsible. (Merriam – Webster)
To cause to appear or be stupid, foolish, or absurdly illogical. (Merriam – Webster)
To impair, invalidate, or make ineffective: Negate. (Merriam – Webster)
To have a dulling or inhibiting effect on. (Merriam – Webster)
If something stultifies you, it makes you feel empty or dull in your mind, because it is so boring. (Collins Dictionary)
Cause to lose enthusiasm and initiative, especially as a result of a tedious or restrictive routine. (Oxford Dictionaries)
Cause (someone) to appear foolish or absurd. (Oxford Dictionaries)
Preventing new ideas from developing. (Cambridge Dictionary)
Let’s Diversify, not Stultify.
Don’t let technology stultify your brain – download a book.
Review: Decrease and Stultify: Contraception and Abortion in American Society.