stringent, bitter, sharp; see severe 2.
"mordant." YourDictionary, n.d. Web. 12 October 2018. <http://thesaurus.yourdictionary.com/Mordant>.
mordant. (n.d.). Retrieved October 12th, 2018, from http://thesaurus.yourdictionary.com/Mordant
So sharp as to cause mental pain:
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