The word 'undistinguishable' is a valid and accepted word in standard written English.
It can be used to describe something that cannot be seen or discerned from something else because there is no difference between them. For example: "The twins were almost completely undistinguishable, even when viewed side by side."
Suppose that two speakers, A and B, are identical psychological twins, so that their psychological states are essentially undistinguishable.
"Melville…reaches straight back into the universal," he wrote, "to a blackness and sadness so transcending our own that they are undistinguishable from glory".
On the excellent blog Marginal Revolution, the economist Tyler Cowen highlights the analysis of the Princeton professor Richard Quandt3, who found that almost of all the wines were "statistically undistinguishable" from each other.
He says that Melville "reaches straight back into the universal, to a blackness and sadness so transcending our own that they are undistinguishable from glory".
And Two Brains is not what you'd call undistinguishable.
On the excellent blog Marginal Revolution, the economist Tyler Cowen highlights the analysis of the Princeton professor Richard Quandt^3^, who found that almost of all the wines were "statistically undistinguishable" from each other.
Actually, one of the recent complaints about Williamsburg is that its art is undistinguishable from that shown across the river.
So many hotels these days are quite undistinguishable from one another and have been designed, it would seem, to obliterate any sense of the local and any element of soul; one ends up, then, remembering the good places and forgetting the rest.
Gorgeous Chilean salmon came adorned with shrimp and corn; but tuna, its satiny texture evanescent on the tongue, deserved an accompaniment more elegant than a baseball of undistinguishable mash that might have been plantain or potato.
In the universal type space all possible types are uniquely represented, and the idea is that two types with exactly the same beliefs about the underlying world of "nature" plus the types of the other players are taken to be undistinguishable.
