Meaning

adjective unwillingness to do something contrary to your custom

adjective (usually followed by `to') strongly opposed

originFrom 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)…

Etymology from Wiktionary, CC BY-SA 3.0