tiny, microscopic, minuscule, negligible; see little 1, minute 1.
"infinitesimal." YourDictionary, n.d. Web. 14 July 2019. <https://thesaurus.yourdictionary.com/infinitesimal>.
infinitesimal. (n.d.). Retrieved July 14th, 2019, from https://thesaurus.yourdictionary.com/infinitesimal
So minute as not to be discernible:
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