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Adjective: indistinguishable  ,in-di'sting-gwi-shu-bul
  1. Exactly alike; incapable of being perceived as different
    "they wore indistinguishable hats";
    - identical
  2. Not capable of being distinguished or differentiated
    "the twins were indistinguishable"; "a colourless person quite indistinguishable from the colourless mass of humanity"; "the two specimens are actually different from each other but the differences are almost indistinguishable";
    - undistinguishable

See also: same