diminutive, tiny, infinitesimal; see little 1, minute 1.
"microscopic." YourDictionary, n.d. Web. 15 January 2019. <https://thesaurus.yourdictionary.com/microscopic>.
microscopic. (n.d.). Retrieved January 15th, 2019, from https://thesaurus.yourdictionary.com/microscopic
So minute as not to be discernible:
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