The story
- Proto-Indo-European*(s)peys-der.?
- Latinspīrō
- Latinspīritus
- Proto-Indo-European*h₃ed-
- Proto-Indo-European*h₃édosder.?
- Medieval Latinspīrituōsus
- Englishspirituous
- English todayspirituously
From spirituous + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.