The story
- Proto-Indo-European*(s)peys-der.?
- Latinspīrō
- Latinspīritu
- Old Frenchespirit
- Middle Englishspirit
- Englishspirit
- Proto-Indo-European*lewh₁-
- Proto-Indo-European*lewHs-
- Proto-Germanic*leusaną
- Proto-Germanic*lausaz
- Englishspiritless
- English todayspiritlessly
From spiritless + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.