hopelessness vs hopeless

hopelessness is a noun but hopeless is not a noun.

Word	Noun	Adjective	Verb	Adverb
hopelessness	Yes	No	No	No
hopeless	No	Yes	No	No

hopelessness (noun)	hopeless (noun)
the despair you feel when you have abandoned hope of comfort or success

hopelessness (adjective)	hopeless (adjective)
	without hope because there seems to be no possibility of comfort or success
	(informal to emphasize how bad it is) beyond hope of management or reform
	certain to fail
	of a person unable to do something skillfully