indiscernible
adjective
not discernible; that cannot be seen or perceived clearly; imperceptible.
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But the loss of individuality implies the presence of indiscernibility; and not to go out of our own department, there are at least three writers who, if but partially, cancel this entry to discredit.
From A History of the French Novel, Vol. 2 To the Close of the 19th Century by George Saintsbury