undistinguishableness

Example:The indistinguishability of the twins from one another made it difficult for guests to tell them apart at the party.

Definition:The quality or state of being indistinguishable; the inability to differentiate or perceive differences between things.

Example:The imperceptibility of the sound made it hard to tell if the recording was of the actual event or a simulation.

Definition:The quality or state of not being perceived; the inability to detect or distinguish.