The story
- Proto-West Germanic · inherited from[Term?]
- Old English · inherited fromblīþelīċe“gladly, blithely”
- Middle English · inherited fromblythely
- English todayblithely
From Middle English blythely, blyþely, bliþeliche, from Old English blīþelīċe (“gladly, blithely”), from Proto-West Germanic [Term?]; compare Dutch blijdelijk. By surface analysis, blithe + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.