unending vs aeonian

unending and aeonian both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unending	No	Yes	No	No
aeonian	No	Yes	No	No

As adjectives, unending and aeonian are synonyms defined as:

Other synonyms of unending include ageless, eonian, eternal, everlasting, perpetual, unceasing.

unending (adjective)	aeonian (adjective)
continuing forever or indefinitely	of or relating to a geological eon (longer than an era)
	continuing forever or indefinitely