indefinable vs untellable

indefinable and untellable both are adjectives.

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

As adjectives, indefinable and untellable are synonyms defined as:

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

indefinable (adjective)	untellable (adjective)
defying expression or description	defying expression or description
not capable of being precisely or readily described; not easily put into words