The Collaborative International Dictionary
Atheisticalness
Atheistic \A`the*is"tic\, Atheistical \A`the*is"tic*al\, a.
-
Pertaining to, implying, or containing, atheism; -- applied to things; as, atheistic doctrines, opinions, or books.
Atheistical explications of natural effects.
--Barrow. Disbelieving the existence of a God; impious; godless; -- applied to persons; as, an atheistic writer. -- A`the*is"tic*al*ly, adv. -- A`the*is"tic*al*ness, n.
Wiktionary
atheisticalness
n. The state or quality of being atheistical.