What is the meaning of Flint-hearted?

(a.) Hard-hearted.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). flint-hearted. Retrieved September 26, 2026, from http://smartdefine.org/flint-hearted/definitions/2008666
ChicagoWebster's. 2011. "flint-hearted" http://smartdefine.org/flint-hearted/definitions/2008666 (accessed September 26, 2026).
HarvardWebster's 2011, flint-hearted, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/flint-hearted/definitions/2008666>.
MLAWebster's. "flint-hearted" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/flint-hearted/definitions/2008666>