grim vs ghastly

grim and ghastly both are adjectives.

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

As adjectives, grim and ghastly are synonyms defined as:

Other synonyms of grim include grisly, gruesome, macabre, sick.

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