Adjective gruff has 2 senses
  1. crusty, curmudgeonly, gruff, ill-humored, ill-humoured - brusque and surly and forbidding; "crusty remarks"; "a crusty old man"; "his curmudgeonly temper"; "gruff manner"; "a gruff reply"
    Antonym: good-natured (indirect, via ill-natured)
  2. gruff, hoarse, husky - deep and harsh sounding as if from shouting or illness or emotion; "gruff voices"; "the dog's gruff barking"; "hoarse cries"; "makes all the instruments sound powerful but husky"- Virgil Thomson
    Antonyms: euphonious, euphonous (indirect, via cacophonous)
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