indistinguishable

英[ɪndɪ'stɪŋgwɪʃəb(ə)l] 美['ɪndɪ'stɪŋgwɪʃəbl]

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"