Etymology
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indistinguishable (adj.)

1640s, "not clearly perceived;" 1650s, "incapable of being told apart," from in- (1) "not, opposite of" + distinguishable. Shakespeare's use of it (c. 1600) seems to mean "of indeterminate shape." Related: Indistinguishably.

updated on November 13, 2015

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Definitions of indistinguishable from WordNet

indistinguishable (adj.)
exactly alike; incapable of being perceived as different;
they wore indistinguishable hats
Synonyms: identical
indistinguishable (adj.)
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
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.