LOATHSOME
disgusting, disgustful, distasteful, foul, loathly, loathsome, repellent, repellant, repelling, revolting, skanky, wicked, yucky
(adjective) highly offensive; arousing aversion or disgust; “a disgusting smell”; “distasteful language”; “a loathsome disease”; “the idea of eating meat is repellent to me”; “revolting food”; “a wicked stench”
nauseating, nauseous, noisome, queasy, loathsome, offensive, sickening, vile
(adjective) causing or able to cause nausea; “a nauseating smell”; “nauseous offal”; “a sickening stench”
Source: WordNet® 3.1
Etymology
Adjective
loathsome (comparative more loathsome, superlative most loathsome)
Highly offensive; abominable, sickening.
Usage notes
• Nouns to which "loathsome" is often applied: disease, creature, thing, person, man, woman, dungeon, place, world, smell, act.
Source: Wiktionary
Loath"some, a.
Definition: Fitted to cause loathing; exciting disgust; disgusting.
The most loathsome and deadly forms of infection. Macaulay.
– Loath"some*ly. adv.
– Loath"some*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition