IPA: //suːˈpɜːrfluəsnəs//
KK: /sʊˈpɜrflʊəsnəs/
The condition of having more than what is needed; excess or unnecessary amount.
The superfluousness of the decorations made the room feel cluttered.
Superfluousness → It is formed from "super-" (meaning above or beyond) and "fluere" (meaning to flow). The suffix "-ness" indicates a state or quality. Thus, superfluousness refers to the state of flowing beyond what is necessary or required.
Think of something that flows 'beyond' ('super-') what is needed — that's why superfluousness means having more than what is necessary.