originality vs unoriginal

originality is a noun but unoriginal is not a noun.

Word	Noun	Adjective	Verb	Adverb
originality	Yes	No	No	No
unoriginal	No	Yes	No	No

originality (noun)	unoriginal (noun)
the quality of being new and original (not derived from something else)
the ability to think and act independently

originality (adjective)	unoriginal (adjective)
	not original; not being or productive of something fresh and unusual