undistinguishable vs indistinguishable

undistinguishable and indistinguishable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
undistinguishable	No	Yes	No	No
indistinguishable	No	Yes	No	No

As adjectives, undistinguishable and indistinguishable are synonyms defined as:

undistinguishable and indistinguishable: not capable of being distinguished or differentiated

undistinguishable (adjective)	indistinguishable (adjective)
not capable of being distinguished or differentiated	not capable of being distinguished or differentiated
	exactly alike; incapable of being perceived as different