From comprehensive + -ness.
- The state of being comprehensive.
1971, Keith Thomas, Religion and the Decline of Magic, Folio Society, published 2012, page 312:
It was this comprehensiveness which made the art so compelling.
1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page viii:
The supplementary bibliography (in Vol. VI) attests to the comprehensiveness of the effort.