jejunity vs inadequacy

jejunity and inadequacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
jejunity	Yes	No	No	No
inadequacy	Yes	No	No	No

As nouns, inadequacy is a hypernym of jejunity; that is, inadequacy is a word with a broader meaning than jejunity:

Other hypernyms of jejunity include inadequateness.

jejunity (noun)	inadequacy (noun)
the quality of being vapid and unsophisticated	unsatisfactoriness by virtue of being inadequate
quality of inadequate nutritive value	lack of an adequate quantity or number
	a lack of competence