uncertain vs uncertainness

uncertain is not a noun while uncertainness is a noun.

Word	Noun	Adjective	Verb	Adverb
uncertain	No	Yes	No	No
uncertainness	Yes	No	No	No

uncertain (noun)	uncertainness (noun)
	being unsettled or in doubt or dependent on chance

uncertain (adjective)	uncertainness (adjective)
not established beyond doubt; still undecided or unknown
lacking or indicating lack of confidence or assurance
not certain to occur; not inevitable
not established or confirmed
ambiguous (especially in the negative)
not consistent or dependable
subject to change