unspeakable vs awful

unspeakable and awful both are adjectives.

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

As adjectives, unspeakable and awful are synonyms defined as:

Other synonyms of unspeakable include abominable, atrocious, dreadful, painful, terrible.

unspeakable (adjective)	awful (adjective)
exceptionally bad or displeasing	offensive or even (of persons) malicious
defying expression or description	causing fear or dread or terror
too sacred to be uttered	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

unspeakable (adverb)	awful (adverb)
	used as intensifiers