responsibleness vs responsible

responsibleness is a noun but responsible is not a noun.

Word	Noun	Adjective	Verb	Adverb
responsibleness	Yes	No	No	No
responsible	No	Yes	No	No

responsibleness (noun)	responsible (noun)
a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct

responsibleness (adjective)	responsible (adjective)
	worthy of or requiring responsibility or trust; or held accountable
	being the agent or cause
	having an acceptable credit rating