indistinguishable vs undistinguishable

indistinguishable and undistinguishable both are adjectives.

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

As adjectives, indistinguishable and undistinguishable are synonyms defined as:

indistinguishable and undistinguishable: not capable of being distinguished or differentiated

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