implacable vs unrelenting

implacable and unrelenting both are adjectives.

Word	Noun	Adjective	Verb	Adverb
implacable	No	Yes	No	No
unrelenting	No	Yes	No	No

implacable (adjective)	unrelenting (adjective)
incapable of being placated	never-ceasing
	not to be placated or appeased or moved by entreaty
	punishingly harsh