unappeasable vs unforgiving

unappeasable and unforgiving both are adjectives.

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

As adjectives, unappeasable and unforgiving are synonyms defined as:

unappeasable and unforgiving: not to be placated or appeased or moved by entreaty

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

unappeasable (adjective)	unforgiving (adjective)
not to be placated or appeased or moved by entreaty	unwilling or unable to forgive or show mercy
	not to be placated or appeased or moved by entreaty