indistinguishable

1. exactly alike; incapable of being perceived as different

- they wore indistinguishable hats

Similar word(s): same, identical

2. not capable of being distinguished or differentiated

- the two specimens are actually different from each other but the differences are almost indistinguishable

- the twins were indistinguishable

- a colorless person quite indistinguishable from the colorless mass of humanity

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