Added 9 October 2026 sullenness noun Categories: FeelingsDescribing WordsRare Words noun ! Definition from Wiktionary (CC BY-SA). More about sullenness at Wordnik → Where our words come from → The state or quality of being sullen. The result or product of being sullen. Related Words: sulkinessmorosenessglumnesssournesssombernesssadnesssurlinessslynesssolemnnesssorrowfulnesssordidnesssombrousness Back to today's word