stringent, bitter, sharp; see severe 2.
"mordant." YourDictionary, n.d. Web. 19 January 2019. <https://thesaurus.yourdictionary.com/mordant>.
mordant. (n.d.). Retrieved January 19th, 2019, from https://thesaurus.yourdictionary.com/mordant
So sharp as to cause mental pain:
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