aeonian vs unending

aeonian and unending both are adjectives.

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

As adjectives, aeonian and unending are synonyms defined as:

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

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