Meaning of “sullen” in the English Dictionary

"sullen" in British English

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sullenadjective

uk /ˈsʌl.ən/ us /ˈsʌl.ən/
sullenly
adverb uk /ˈsʌl.ən.li/ us /ˈsʌl.ən.li/

She turned her back to him and stared sullenly out of the window.
sullenness
noun [ U ] uk /ˈsʌl.ən.nəs/ us /ˈsʌl.ən.nəs/

(Definition of “sullen” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sullen" in American English

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sullenadjective

us /ˈsʌl·ən/

silent and unpleasant:

They stared at him with an expression of sullen dislike.
fig. The skies looked very sullen (= dark and unpleasant).

(Definition of “sullen” from the Cambridge Academic Content Dictionary © Cambridge University Press)