unspeakable vs painful

unspeakable and painful both are adjectives.

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

As adjectives, unspeakable and painful are synonyms defined as:

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

unspeakable (adjective)	painful (adjective)
exceptionally bad or displeasing	causing physical or psychological pain
defying expression or description	exceptionally bad or displeasing
too sacred to be uttered	causing physical discomfort
	causing misery or pain or distress