This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Brusque or stern in manner or appearance: a gruff reply.

adj. Hoarse; harsh: a gruff voice.

adj. having a rough, surly, or harsh nature.

adj. hoarse voiced.

adj. Of a rough or stern manner, voice, or countenance; sour; surly; severe; harsh.

Rough or stern in manner, voice, or countenance; surly; severe; harsh.

n. In pharmacy, the coarse residue which will not pass through the sieve in pulverization.

n. In mining, a pit or shaft.

n. Crude or impure saltpeter, as imported from India.

adj. brusque and surly and forbidding

adj. deep and harsh sounding as if from shouting or illness or emotion

"First Impression: Harley is described as a gruff, nasty, and rebellious biker."

ill-natured    cacophonous    cacophonic   

gruffness    gruffly   

sour    surly    severe    harsh    rough   

Slough    bluff    bruff    buff    cuff    duff    enough    fluff    guff    hough   

brusque    curt    husky    guttural    throaty    surly    harsh    raucous    sarcastic    sullen