1. exactly alike; incapable of being perceived as different;
"rows of identical houses""cars identical except for their license plates""they wore indistinguishable hats"
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"