GRUFF is validvalid

low and harsh in speech [adj GRUFFER, GRUFFEST] : GRUFFLY [adv], GRUFFNESS [n] / to speak in a rough pitch [v GRUFFED, GRUFFING, GRUFFS]

8,901 of 196,601 in NWL2023·also valid in CSW24

to utter in a gruff voice [v -ED, -ING, -S] / low and harsh in speech [adj GRUFFER, GRUFFEST, GRUFFLY]