hardmouthed

[ hahrd-mouth d, -moutht ]
/ ˈhɑrdˌmaʊðd, -ˌmaʊθt /

adjective

of or relating to a horse not sensitive to the pressure of a bit.
stubborn; obstinate; self-willed.

Origin of hardmouthed

First recorded in 1610–20; hard + mouth + -ed3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for hard-mouthed

hard-mouthed

adjective

(of a horse) not responding satisfactorily to a pull on the bit
stubborn; obstinate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012