incessant vs unceasing

incessant and unceasing both are adjectives.

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

As adjectives, incessant and unceasing are synonyms defined as:

incessant and unceasing: uninterrupted in time and indefinitely long continuing

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

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