To stultify someone is to dull their mind — to make them slow, bored, and less able to think, usually by keeping them in something empty and repetitive for a long time. The picture is not one bad afternoon; it is a job, a school, or a system that slowly wears the sharpness out of a person. In practice you meet it most often as the -ing describing word, stultifying: a stultifying job, stultifying boredom, the stultifying routine of the office. That form is far more common than the plain verb, so learn it first. You also see stultified for the result: 'a stultified imagination'. The word carries real criticism, and it is usually aimed at a system rather than a person. Writers use it about factory work, bureaucracy, exam-focused schooling — anything that treats people as machines. Behind it is a strong claim: this thing is not merely boring, it is damaging your ability to think. It is a formal, written word, at home in essays, criticism, and serious journalism. Nobody says 'this meeting is stultifying' to a friend; they say 'this is so boring I want to die'. Recognise it when you read it, and use it in writing when 'boring' is too weak for what you mean. There is also a narrow legal use — to stultify oneself is to argue that you were not of sound mind — but you can safely ignore that one.

使人變得遲鈍麻木、扼殺思考力（不只是無聊，是長期消磨掉一個人的腦袋）。最常見的是形容詞 stultifying，如 a stultifying job 令人麻木的工作、stultifying boredom 令人腦袋鈍化的無聊。屬於正式書面用語。