Indistinguishable /(ĭn`dĭs*tĭṉ"gwĭsh*ȧ*b'l)/

In·dis·tin·guish·a·ble

Indistinguishable

a.
  1. Not distinguishable; not capable of being perceived, known, or discriminated as separate and distinct; hence, not capable of being perceived or known; as, in the distance the flagship was indisguishable; the two copies were indisguishable in form or color; the difference between them was indisguishable.