indistinguishable
[adjective]
Synonyms: same, duplicate, equal, equivalent, identic, identical, tantamount

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Antonyms: distinguishable

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English Thesaurus: the same, just like/exactly like, identical, indistinguishable, equal, ...

[TahlilGaran] English Synonym Dictionary ▲

in‧dis‧tin‧guish‧a‧ble /ˌɪndɪˈstɪŋɡwɪʃəbəl/ adjective
things that are indistinguishable are so similar that you cannot see any difference between them
indistinguishable from
an artificial material that is almost indistinguishable from real silk

[TahlilGaran] Dictionary of Contemporary English ▲

the same used to say that two people, things, events etc are exactly like each other:
The houses on the street all look the same.
They were doing the same jobs as the men, but being paid less.
just like/exactly like especially spoken used to say that there is very little difference between two people, things etc:
He’s just like his father.
There are insects that look exactly like green leaves.
identical identical things are exactly the same in every way:
The tablets were identical in size, shape, and colour.
identical names
indistinguishable two things that are indistinguishable are so similar that it is impossible to know which is which or to see any differences between them:
The copy was indistinguishable from the original painting.
equal two or more amounts, totals, levels etc that are equal are the same as each other:
Spend an equal amount of time on each essay question.
be no different from somebody/something to be the same, even though you expect them to be different:
People often think that movie stars are special, but really they’re no different from anybody else.
can’t tell the difference (also can’t tell somebody/something apart) especially spoken if you can’t tell the difference between two people or things, or if you can’t tell them apart, they look, sound, or seem exactly the same to you:
Emma and Louise sound so alike on the phone that I can’t tell the difference.

[TahlilGaran] English Thesaurus ▲