IPA: //ˈsiːs.ləs.nəs//
KK: /ˈsiːs.ləs.nəs/
The state of continuing without stopping; something that goes on forever or does not have an end.
The ceaselessness of the waves crashing against the shore was both calming and overwhelming.
Ceaselessness → It is formed from "cease" (from Old French *ceser*, meaning to stop) and "-less" (meaning without) and "-ness" (meaning the state of). The word "ceaselessness" refers to the state of being without stopping or interruption.
Think of 'cease' meaning to stop, and 'less' meaning without — so ceaselessness means the state of being without any stops.