Exactly alike; incapable of being perceived as different:
— They wore indistinguishable hats.
Roget 447: invisible, imperceptible; undiscernible†, indiscernible; unapparent, non-apparent; out of sight, not in sight; a perte de vue [Fr.]; behind the scenes, behind the curtain; viewless, sightless; ... show more
Polish: równy, jednoraki, taki sam, jednakowy
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.
Moby thesaurus: alike, all one, all the same, blear, bleared, bleary, blurred, blurry, confused, consubstantial, dark, dim, duplicate, equal, equivalent, exactly alike, faint, feeble, filmy, foggy ... show more.
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