OE fen glad, rejoicing ＜ Gmc fain-, faan- (ON feginn) ← fa🔗⭐🔉

OE fen glad, rejoicing ＜ Gmc fain-, faan- (ON feginn) ← faχ- (OE efon to rejoice) ← ? IE pek- to make pretty: cf. fair^１ fain^２ /fn/

研究社新英和大辞典 ページ 188957 での【ON feginn】単語。