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stultify (stul·ti·fy): / STUHL tuh fahy /
transitive verb

(1) to make or cause to appear to be stupid, foolish, or ridiculous
(2) to render useless or ineffectual; to invalidate or impair
(3) to dull or inhibit, especially interest or mental acuity, often by repetitive, menial, boring, or tedious methods or activities
(4) to allege or prove someone to be of unsound mind and hence not responsible under the law (legal; archaic)

[From Latin stultificare meaning “to make foolish,” from Latin stultus meaning “foolish” (literally “immovable”).]

Usage: Most television and movie productions are of such substandard quality that they stultify the mind.