cumbersomeness vs cumbersome

cumbersomeness is a noun but cumbersome is not a noun.

Word	Noun	Adjective	Verb	Adverb
cumbersomeness	Yes	No	No	No
cumbersome	No	Yes	No	No

cumbersomeness (noun)	cumbersome (noun)
trouble in carrying or managing caused by bulk or shape

cumbersomeness (adjective)	cumbersome (adjective)
	not elegant or graceful in expression
	difficult to handle or use especially because of size or weight