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: unable to be recognized as different : impossible to distinguish clearly from something els
The copy and the original are practically indistinguishable. [=identical]
— usually + from
The copy is practically indistinguishable from the original. [=the copy and the original are so similar that it is almost impossible to see any difference between them]
— indistinguishably /ˌɪndɪˈstɪŋgwɪʃəbli/ adverb
The flavors merged indistinguishably together