perpetual vs incessant

perpetual and incessant both are adjectives.

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

As adjectives, perpetual and incessant are synonyms defined as:

perpetual and incessant: uninterrupted in time and indefinitely long continuing

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

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