IPA: /ˈɡraʊnd.ləs.nəs/
KK: /ˈɡraʊndləsnəs/
The state of having no basis or foundation in reality or truth.
The accusations against him were based on groundlessness, leading to his exoneration.
Groundlessness → It is formed from "ground" (from Old English "grund", meaning the solid surface of the earth) and "-lessness" (meaning without). The word "groundlessness" refers to the state of being without a solid foundation or basis.
Think of 'ground' as the solid surface we stand on, and '-lessness' means without. So, groundlessness means being without a solid foundation.