Undistinguishable

//ˌʌndɪˈstɪŋɡwɪʃəb(ə)l// adj

Definitions

Adjective
  1. 1
    Imperceptible; indistinct.
  2. 2
    Indistinguishable.

    "Here I obtained the rare and beautiful swallow-tail butterflies, Papilio aenomaus and P. liris; the males of which are quite unlike each other, and belong in fact to distinct sections of the genus, while the females are so much alike that they are undistinguishable on the wing, and to an uneducated eye equally so in the cabinet."

Adjective
  1. 1
    not capable of being distinguished or differentiated wordnet

Etymology

From un- + distinguishable.

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