IPA: //ˈbeɪsməntləs//
KK: /ˈbeɪsməntləs/
Not having a lower level or floor that is below ground level.
The new house is basementless, making it easier to maintain the yard.
Basementless → It is formed from "basement" (from Old French *basement*, meaning a lower part or foundation) and "-less" (meaning without). The word "basementless" means without a basement or lacking a lower level.
Think of a building that is 'without' ('-less') a 'basement' — that's what basementless means.