fatuity

plural fatuities

1. countableuncountableWeakness or imbecility of mind; stupidity.
2. countableuncountableSomething fatuous; a stupid idea or utterance.

   1 more example

   Like Joel Miller’s friend, the Senior Wrangler, who bowed to the audience from his box at the play, because he and the king happened to enter the theatre at the same time, only with a fatuity by no means so agreeable to himself, poor Arthur Pendennis felt perfectly convinced that all England would remark the absence of his name from the examination-lists, and talk about his misfortune.

   1848 November – 1850 December, William Makepeace Thackeray, chapter 21, in The History of Pendennis. […], volume (please specify |volume=I or II), London: Bradbury and Evans, […], published 1849–1850, →OCLC