Added 9 October 2026 seriousness /ˈsɪɹiəsnəs/ noun Categories: FeelingsDescribing WordsUncommon Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about seriousness at Wordnik → Where our words come from → The state or quality of being serious. Related Words: earnestnesssinceritydistressfulnessserious-mindednessearnestseriouslysolemnitythoroughnesshonestytruthfulnessveracitysoundness Back to today's word