Where does “unseriousness” come from?

unseriousness (English) comes from English unserious, from English serious, from Middle English seryows, from Old French serieux, from Medieval Latin seriosus, from Latin sērius, from Latin sērus, from Proto-Italic swerjos — to ache; to fester; wound; injury.

unseriousness (English): The state or quality of being unserious

Definitions

  1. The state or quality of being unserious

Ancestry of “unseriousness”, step by step

unseriousness traces back through two separate lines of ancestry.

via English unserious

StepLanguageWordMeaning
1EnglishunseriousNot serious; flippant
2EnglishseriousWithout humor or expression of happiness; grave...
3Middle Englishseryows
4Old Frenchserieux
5Medieval Latinseriosusserious
6Latinsēriusgrave; earnest; serious
7Latinsēruslate, too late
8Proto-Italicswerjos
9Proto-Indo-Europeanswer-yo-s
10Proto-Indo-Europeanswer-to ache; to fester; wound; injury

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European swer-Every word from Proto-Indo-European swer-yo-sEvery word from Proto-Italic swerjos