Wiktionary
unendingness
n. The state or quality of being unending.
Usage examples of "unendingness".
And then all mysteries were to find their unendingness, and all echoes to be answered only by their own voices.
It is the knowledge of the unendingness and of the repetitious uselessness, the do it up so it can be done again, that makes Fatigue fatigue.
The road had the horrid unendingness of a dream of frustration and longing, but there seemed nothing to do except follow it to its end, and hope to find a village or a farm at which he could ask the way.
I cannot say, for in my then state of nervous tension the hours dragged with the awful unendingness of eternity.