The story
- Proto-West Germanic · inherited from*laiþasam
- Old English · inherited from*lāþsum
- Middle English · inherited fromlothsum
- English todayloathsome
From Middle English lothsum, from Old English *lāþsum, from Proto-West Germanic *laiþasam, equivalent to loath + -some. Cognate with Middle Low German lêtsam (“arduous”), German leidsam (“sad, sorry”).
Etymology from Wiktionary, CC BY-SA 4.0.