[adjective] [not gradable] - impossible to judge as being different when compared to another similar thingThe markings on this type of fish make it virtually indistinguishable from the sand it swims over.These forgeries are so good that they are more or less indistinguishable from the originals.Which of these indistinguishable candidates are you going to vote for?
INDISTINGUISHABLE
Meaning of INDISTINGUISHABLE in English
Cambridge English vocab. Кембриджский английский словарь. 2012