undistinguishable

/ˌʌndɪˈstɪŋɡwɪʃəbəl/
adjective
  1. Impossible to tell apart or recognize as different; identical in appearance or nature.
    • The twins were so alike that they were nearly undistinguishable to strangers.
    • In the fog, the shapes of the buildings became undistinguishable from one another.
    • The counterfeit bills were undistinguishable from real money without a special light.
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