English
festally
From festal + -ly.
Formed from festal + -ly
Proto-Indo-European *dʰeh₁stos
…
Proto-Italic *fēstos
Latin fēstus ‘feast-like’
Latin festum ‘feast’
Middle French festal
English festal
Today it means
adv in a festal or festive manner
Language periods are conventional ranges, not dates for this word.
Etymograph / festally