ghastly vs gruesome

ghastly and gruesome both are adjectives.

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

As adjectives, ghastly and gruesome are synonyms defined as:

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

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