casual vs casualness

casual is not a noun while casualness is a noun.

Word	Noun	Adjective	Verb	Adverb
casual	No	Yes	No	No
casualness	Yes	No	No	No

casual (noun)	casualness (noun)
	a casual manner
	The state of coming without regularity; of being occasional or incidental.

casual (adjective)	casualness (adjective)
hasty and without attention to detail; not thorough
not showing effort or strain
occurring on a temporary or irregular basis
marked by blithe unconcern
appropriate for ordinary or routine occasions
occurring or appearing or singled out by chance
natural and unstudied
characterized by a feeling of irresponsibility
without or seeming to be without plan or method; offhand