FATUITY
absurdity, fatuity, fatuousness, silliness
(noun) a ludicrous folly; “the crowd laughed at the absurdity of the clown’s behavior”
Source: WordNet® 3.1
Etymology
Noun
fatuity (countable and uncountable, plural fatuities)
Weakness or imbecility of mind; stupidity.
Something fatuous; a stupid idea or utterance.
Source: Wiktionary
Fa*tu"i*ty, n. Etym: [L. fatuitas, fr. fatuus foolish: cf. F. fatuité
Cf. Fatuous.]
Definition: Weakness or imbecility of mind; stupidity.
Those many forms of popular fatuity. I Taylor.
Source: Webster’s Unabridged Dictionary 1913 Edition