IPA: /hɪˈdiəsnəs/
KK: /hɪˈdiəsnəs/
The quality or state of being very ugly or unpleasant to look at.
The hideousness of the abandoned building shocked everyone who passed by.
Hideousness → It is formed from "hideous" (from Old French *hideus*, meaning frightful or horrible) and "-ness" (meaning the state or quality of). The word "hideousness" refers to the state of being hideous or extremely ugly.
Think of something that is 'frightful' ('hideous') and the '-ness' indicating a state. This helps you remember that 'hideousness' means the quality of being frightfully ugly.