indefinable vs unspeakable

indefinable and unspeakable both are adjectives.

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

As adjectives, indefinable and unspeakable are synonyms defined as:

Other synonyms of indefinable include indescribable, ineffable, untellable, unutterable.

indefinable (adjective)	unspeakable (adjective)
defying expression or description	exceptionally bad or displeasing
not capable of being precisely or readily described; not easily put into words	defying expression or description
	too sacred to be uttered