English
loathsomely
From loathsome + -ly.
A compound of loathsome + -ly
Proto-Indo-European *h₂leytos ‘abhorrence, loath’
…
Proto-West Germanic *laiþ ‘loathsome, detestable, hated’
Proto-West Germanic *laiþasam ‘painful, horrible, tiresome, hated’
Old English *lāþsum ‘ugly, detestable’
Middle English lothsum
English loathsome
Today it means
adv In a way that is loathsome.
Language periods are conventional ranges, not dates for this word.
Etymograph / loathsomely