The story
- Proto-Indo-European*h₂eḱ-
- Proto-Indo-European*h₂eḱrós
- Proto-Italic*akris
- Classical Latinācer
- Late Latinācrus
- Old Frenchaigre
- Middle Englishegre
- Middle Englishegrenesse
- English todayeagerness
From Middle English egernesse, egrenesse; equivalent to eager + -ness.
Etymology from Wiktionary, CC BY-SA 4.0.