Fromnull +‎-ness.

nullness (uncountable)

1. The quality of beingnull orempty.
   • 2021,A. K. Blakemore,The Manningtree Witches, Granta Books, page169:

     He stares off into thenullness of the blue-grey sky, upright in the saddle, and there is no exultance in his face as we are led away.

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