hard-mouthed
/ˌhɑːdˈmaʊðd/ /ˌhɑːdˈmaʊθt/adjective
1Of a horse: not easily controlled with the bit or reins. Also in extended use, of a boat: difficult to steer or manoeuvre.
2 Figurative. Wilful, headstrong; obstinate. Now somewhat rare.
- Originally as part of an extended metaphor..
3Harsh or uncouth in speech or language; foul-mouthed.
Origin
Mid 16th century; earliest use found in Thomas Cooper (c1517–1594), theologian and bishop of Winchester. From hard + mouthed.