hardmouthed

[hahrd-mouth d, -moutht]

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adjective

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

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Origin of hardmouthed

First recorded in 1610–20; hard + mouth + -ed³

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018