relentless vs continual

relentless and continual both are adjectives.

Word	Noun	Adjective	Verb	Adverb
relentless	No	Yes	No	No
continual	No	Yes	No	No

relentless (adjective)	continual (adjective)
never-ceasing	recurring regularly or frequently in a prolonged and closely spaced series
not to be placated or appeased or moved by entreaty	having no interruptions