jejuneness vs jejune

jejuneness is a noun but jejune is not a noun.

Word	Noun	Adjective	Verb	Adverb
jejuneness	Yes	No	No	No
jejune	No	Yes	No	No

jejuneness (noun)	jejune (noun)
the quality of being vapid and unsophisticated
quality of inadequate nutritive value
lacking and evidencing lack of experience of life

jejuneness (adjective)	jejune (adjective)
	displaying or suggesting a lack of maturity
	of insufficient quantity to meet a need
	lacking interest or significance or impact