gruesome vs ghastly

gruesome and ghastly both are adjectives.

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

As adjectives, gruesome and ghastly are synonyms defined as:

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

gruesome (adjective)	ghastly (adjective)
shockingly repellent; inspiring horror	shockingly repellent; inspiring horror
	gruesomely indicative of death or the dead