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English definition of “gruff”

gruff

adjective [-er/-est only]  /ɡrʌf/ us  
dealing with people in a way that lacks patience and seems unfriendly: He has that gruff exterior, but underneath he’s very kind. If a person’s voice is gruff, it sounds low and slightly damaged.
gruffly
adverb  /ˈɡrʌf·li/ us  
"You drive," Casey gruffly told Jack.
(Definition of gruff from the Cambridge Academic Content Dictionary © Cambridge University Press)
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