(countable and uncountable, plural sullennesses)
From sullen + -ness
"sullenness." YourDictionary, n.d. Web. 16 September 2018. <http://www.yourdictionary.com/sullenness>.
sullenness. (n.d.). Retrieved September 16th, 2018, from http://www.yourdictionary.com/sullenness
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