eonian vs unending

eonian and unending both are adjectives.

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

As adjectives, eonian and unending are synonyms defined as:

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

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