The story
- Proto-Indo-European*h₁ed-
- Proto-Indo-European*h₁édti
- Proto-Italic*edō
- Latinedō
- Latinedāx
- Proto-Indo-European*h₃ed-
- Proto-Indo-European*h₃édosder.?
- English todayedacious
From Latin edāx (“gluttonous; greedy”) + English -ious (adjectival suffix).
Etymology from Wiktionary, CC BY-SA 4.0.