untellable vs indefinable

untellable and indefinable both are adjectives.

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

As adjectives, untellable and indefinable are synonyms defined as:

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

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