never-ending vs unceasing

never-ending and unceasing both are adjectives.

Word	Noun	Adjective	Verb	Adverb
never-ending	No	Yes	No	No
unceasing	No	Yes	No	No

As adjectives, never-ending and unceasing are synonyms defined as:

never-ending and unceasing: uninterrupted in time and indefinitely long continuing

Other synonyms of never-ending include ceaseless, constant, incessant, perpetual, unremitting.

never-ending (adjective)	unceasing (adjective)
uninterrupted in time and indefinitely long continuing	uninterrupted in time and indefinitely long continuing
	continuing forever or indefinitely