undistinguishable(a = adj.all) indistinguishable - not capable of being distinguished or differentiated; "the two specimens are actually different from each other but the differences are almost indistinguishable"; "the twins were indistinguishable"; "a colorless person quite indistinguishable from the colorless mass of humanity"

undistinguishable, adj. (often foll. by from) indistinguishable.

N  indiscrimination, indistinguishability, indistinctness, indistinction, uncertainty, incomparability, indiscriminate, undistinguished, indistinguishable, undistinguishable, unmeasured, promiscuous, undiscriminating, valeat quantum valere potest.