never-ending vs ceaseless

never-ending and ceaseless both are adjectives.

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

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

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

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

never-ending (adjective)	ceaseless (adjective)
uninterrupted in time and indefinitely long continuing	uninterrupted in time and indefinitely long continuing