English

infestivity

From in- + festivity.

Proto-Indo-European *h₁én ‘in’

Proto-Germanic *in ‘into’

English in-

Proto-Indo-European *dʰeh₁stos

…

Latin fēstīvus ‘joyous, festive’

Latin festīvitas ‘festivity, merriment, joy, mirth’

Middle French festivité

Middle English festivite

Today it means

noun A lack of festivity, cheerfulness, or mirth.

Language periods are conventional ranges, not dates for this word.

Etymograph / infestivity