The story
- Proto-West Germanic · inherited from*īdlanassī
- Old English · inherited fromīdelnes
- Middle English · inherited fromydelnesse
- English todayidleness
From Middle English ydelnesse, from Old English īdelnes, from Proto-West Germanic *īdlanassī, equivalent to idle + -ness. Cognate with Old Frisian īdelnisse (“idelness”), obsolete Dutch ijdelnis, Old Saxon īdalnussi (“idleness, vanity”), Old High German ītalnissa (“idleness, vanity, emptiness”).
Etymology from Wiktionary, CC BY-SA 4.0.