implacable vs unforgiving

implacable and unforgiving both are adjectives.

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

implacable (adjective)	unforgiving (adjective)
incapable of being placated	unwilling or unable to forgive or show mercy
	not to be placated or appeased or moved by entreaty