relentless vs inexorable

relentless and inexorable both are adjectives.

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

As adjectives, relentless and inexorable are synonyms defined as:

relentless and inexorable: not to be placated or appeased or moved by entreaty

Other synonyms of relentless include grim, stern, unappeasable, unforgiving, unrelenting.

relentless (adjective)	inexorable (adjective)
never-ceasing	not to be placated or appeased or moved by entreaty
not to be placated or appeased or moved by entreaty	impervious to pleas, persuasion, requests, reason