word choice - Adjective antonym of "discriminate"


In biology, hierarchical clustering is used to separate studied samples into different groups, thus if successful, the clustering criteria can be seen to "discriminate" between group A vs. B.


I am stuck trying to find an appropriate word to convey that two samples are so similar that they are "indiscriminable". It appears as that's not a word featured in dictionaries. I have tried "indiscernable" and that doesn't sound right either, neither does "inseparable".


What is a good adjective to use in this case? Should I try to rephrase my sentence?



PS: Please consider that this question refers to academic writing (in other words, "formal register" only).



Answer



You are very likely looking for indistinguishable:



adjective
not able to be identified as different or distinct:
the counterfeit bills were virtually indistinguishable from the real thing



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