unceasing vs unending

unceasing and unending both are adjectives.

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

As adjectives, unceasing and unending are synonyms defined as:

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

unceasing (adjective)	unending (adjective)
uninterrupted in time and indefinitely long continuing	continuing forever or indefinitely
continuing forever or indefinitely