infelicitous vs inapt

infelicitous and inapt both are adjectives.

Word	Noun	Adjective	Verb	Adverb
infelicitous	No	Yes	No	No
inapt	No	Yes	No	No

infelicitous (adjective)	inapt (adjective)
not appropriate in application; defective	not elegant or graceful in expression
marked by or producing unhappiness