indistinguishable

in- +‎ distinguishable

indistinguishable (comparative more indistinguishable, superlative most indistinguishable)

1. Not distinguishable; not capable of being perceived, known, or discriminated as separate and distinct
   • 1973, Arthur C. Clarke, Profiles of the Future (revised):

     Any sufficiently advanced technology is indistinguishable from magic

2. Not capable of being perceived or known.

• distinguishable
• (not capable of being perceived as separate and distinct): fuzzy, ill-defined, indistinct; see also Thesaurus:indistinct
• (not capable of being perceived): invisible, undetectable

• indistinguishability

indistinguishable (plural indistinguishables)

1. Any of a set of things that cannot be distinguished.