Indistinguishable/ˌɪndɪˈstɪŋɡwɪʃəbl/ Definition 1 of 2Pro Tip 1/3Visual Similarity Use when two things look so similar, telling them apart is hard. The counterfeit bills were indistinguishable from the real ones. Pro Tip 2/3Close Comparison Implies a need to look closely to notice any differences. To the untrained eye, the painting is indistinguishable from the original. Pro Tip 3/3Identical Features Highlighting the lack of distinct or unique features. All the houses in the neighborhood were indistinguishable.