From fr.wiktionary.org:
** [en]
[en]
*** [adjectif]
[pron=ɡɹʌf] GRUFF [ɡɹʌf]
1. Bourru .
**** [dérivés]
- gruffly
- _I fancy he must have belonged to some society sworn to abstain from bread and jam; for he declined it quite GRUFFLY , as if he were vexed at being tempted with it, and he added that it was his duty to turn us off._ [[Jerome K. Jerome] , _吴语: Trois hommes dans un bateau_ , VIII, 1889]
- gruffness
*** [prononciation]
- [Sud de l'Angleterre (Royaume-Uni)]