unappeasable vs grim

unappeasable and grim both are adjectives.

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

As adjectives, unappeasable and grim are synonyms defined as:

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

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

unappeasable (adjective)	grim (adjective)
not to be placated or appeased or moved by entreaty	shockingly repellent; inspiring horror
	filled with melancholy and despondency
	causing dejection
	not to be placated or appeased or moved by entreaty
	harshly ironic or sinister
	harshly uninviting or formidable in manner or appearance