limitlessness vs limitless

limitlessness is a noun but limitless is not a noun.

Word	Noun	Adjective	Verb	Adverb
limitlessness	Yes	No	No	No
limitless	No	Yes	No	No

limitlessness (noun)	limitless (noun)
the quality of being infinite; without bound or limit

limitlessness (adjective)	limitless (adjective)
	having no limits in range or scope
	without limits in extent or size or quantity
	seemingly boundless in amount, number, degree, or especially extent