horrendous vs awful

horrendous and awful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
horrendous	No	Yes	No	No
awful	No	Yes	No	Yes

As adjectives, horrendous and awful are synonyms defined as:

Other synonyms of horrendous include dire, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrific, terrible.

horrendous (adjective)	awful (adjective)
causing fear or dread or terror	offensive or even (of persons) malicious
	causing fear or dread or terror
	exceptionally bad or displeasing
	extreme in degree or extent or amount or impact
	inspiring awe or admiration or wonder
	inspired by a feeling of fearful wonderment or reverence

horrendous (adverb)	awful (adverb)
	used as intensifiers