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English definition of “sullen”

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sullen

adjective uk   /ˈsʌl.ən/ us  
angry and unwilling to smile or be pleasant to people: His daughters stared back at him with an expression of sullen resentment. literary She looked up at the sullen (= dark and unpleasant) sky and shuddered.
sullenly
adverb uk   /-li/ us  
She turned her back to him and stared sullenly out of the window.
sullenness
noun [U] uk   /-nəs/ us  
(Definition of sullen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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