The words used in speaking and writing have opposite and similar meanings to other words. The antonym of the word sullen is cheerful.
An antonym is a word that has the opposite meaning of the other and is contradictory and contrasting to the given word. Antonyms are the antagonist, and synonyms are similar words.
Sullen means bad-tempered, sulky and gloomy mood that is used to express the depressed and resentful moments. Its opposite will be cheerful as it means to be happy.
Therefore, cheerful is the antonym of the word sullen.
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