unforgiving vs unappeasable

unforgiving and unappeasable both are adjectives.

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

As adjectives, unforgiving and unappeasable are synonyms defined as:

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

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

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