frightful vs horrifying

frightful and horrifying both are adjectives.

Word	Noun	Adjective	Verb	Adverb
frightful	No	Yes	No	No
horrifying	No	Yes	No	No

As adjectives, frightful and horrifying are synonyms defined as:

Other synonyms of frightful include atrocious, horrible, ugly.

frightful (adjective)	horrifying (adjective)
provoking horror	provoking horror
extremely distressing
extreme in degree or extent or amount or impact