IPA: /ˈloʊθsəmli/
KK: /loʊθsəmli/
In a manner that is extremely unpleasant or disgusting.
The food was loathsomely spoiled, making it impossible to eat.
Loathsomely → It is formed from "loath" (from Old English "lath", meaning hateful or offensive) and "-some" (meaning characterized by or causing). The word "loathsomely" means in a manner that is characterized by hatefulness or disgust.
Think of something that is 'hateful' ('loath') and 'causing' ('-some') feelings of disgust — that's why loathsomely describes something done in a disgusting manner.