Not distinguishable; not capable of being perceived, known, or discriminated as separate and distinct; hence, not capable of being perceived or known; as, in the distance the flagship was indisguishable; the two copies were indisguishable in form or color; the difference between them was indisguishable.
Any sufficiently advanced technology is indistinguishable from magic. Arthur C. Clarke
As soon as men decide that all means are permitted to fight an evil, then their good becomes indistinguishable from the evil that they set out to destroy. Christopher Dawson
The Japanese have perfected good manners and made them indistinguishable from rudeness. Paul Theroux
I always laugh at these rock n'rollers where you can't understand them. Mind you, it's not because they're inaudible or indistinguishable; it's because they're too obscure. Harry Connick, Jr.
I think there was a revolution in poetry, associated chiefly with Eliot and Pound; but maybe it is of the nature of revolutions or of the nature of history that their innovations should later come to look trivial or indistinguishable from technical tricks. Howard Nemerov