ceaseless vs unceasing

ceaseless and unceasing both are adjectives.

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

As adjectives, ceaseless and unceasing are synonyms defined as:

ceaseless and unceasing: uninterrupted in time and indefinitely long continuing

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

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