IPA: /ˈloʊθsəmnəs/
KK: /ˈloʊθsəmnəs/
The quality of being extremely unpleasant or disgusting, which causes a strong feeling of dislike or disgust.
The loathsomeness of the smell made everyone leave the room.
Loathsomeness → It is formed from "loath" (from Old English *lath*, meaning hateful or offensive) and "-some" (meaning characterized by or causing). The suffix "-ness" indicates a state or quality. Thus, loathsomeness refers to the quality of being hateful or offensive.
Think of something that is 'hateful' ('loath') and 'characterized by' ('-some') that quality, leading to the state of being very unpleasant.