excitement vs unexciting

excitement is a noun but unexciting is not a noun.

Word	Noun	Adjective	Verb	Adverb
excitement	Yes	No	No	No
unexciting	No	Yes	No	No

excitement (noun)	unexciting (noun)
something that agitates and arouses
disturbance usually in protest
the feeling of lively and cheerful joy
the state of being emotionally aroused and worked up

excitement (adjective)	unexciting (adjective)
	not exciting
	not stimulating