The story
- Proto-Indo-European*(s)peys-der.?
- Latinspīrō
- Latinspīritus
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Latinspīritālis
- English todayspiritally
From Latin spīritālis (“belonging to breathing”) + English -ly.
Etymology from Wiktionary, CC BY-SA 4.0.