(n.) Supposed deterioration of a person’s mental or intellectual state, especially viewed as a result of overconsumption of material (now particularly online content) considered to be trivial or unchallenging. Also: something characterized as likely to lead to such deterioration.

“The devil take Don Quixote of La Mancha! How did you get this far without dying from all the beatings you’ve received? You’re a madman, and if you were a madman in private, behind the doors of your madness, it wouldn’t be so bad, but you have the attribute of turning everyone who deals with you or talks to you into madmen and fools, too; if you don’t believe me, just look at these gentlemen who are accompanying you. Return, fool, to your house, and look after your estate, your wife, and your children, and stop this nonsense that is rotting your brain and ruining your mind.”