grim vs unappeasable

grim and unappeasable both are adjectives.

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

As adjectives, grim and unappeasable are synonyms defined as:

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

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

grim (adjective)	unappeasable (adjective)
shockingly repellent; inspiring horror	not to be placated or appeased or moved by entreaty
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