loath

The story

1. Proto-Indo-European · derived from*h₂leyt-“to do something abhorrent or hateful”
2. Proto-Germanic · inherited from*laiþaz“loath; hostile; sad, sorry”
3. Old Norse · derived fromleið
4. Old English · inherited fromlāð
5. Middle English · inherited fromlōth“loath; averse, hateful”
6. English todayloath

From Middle English lōth (“loath; averse, hateful”), from Old English lāð, lāþ (“evil; loathsome”), or Old Norse leið, leiðr (“uncomfortable; tired”) from Proto-Germanic *laiþaz (“loath; hostile; sad, sorry”), ultimately from Proto-Indo-European *h₂leyt- (“to do something abhorrent or hateful”). The word is cognate with Danish led (“disgusting, loathsome; nasty”), Dutch leed (“sad; (Belgium) angry”), French laid (“ugly; morally corrupt”), Catalan lleig (“ugly”), Icelandic leiður (“annoyed, vexed; sad; (archaic or poetic) annoying, wearisome”), Italian laido (“filthy, foul; obscene”), Old Frisian leed, Old High German leid (Middle High German leit, modern German leid (“uncomfortable”), Leid (“grief, sorrow, woe; affliction, suffering; harm, injury; wrong”)), Old Saxon lêð, lēth (“evil person or thing”), Swedish led (“bored; tired; (archaic) disgusting, loathsome; evil”).