Where does “seldomness” come from?

seldomness (English) comes from English seldom, from Middle English seldom, from Old English seldan, from Proto-Germanic seldana, from Proto-Germanic seldanē, from Proto-Germanic seldanaz — rare, strange.

seldomness (English): Rareness; infrequency; uncommonness

Definitions

  1. Rareness; infrequency; uncommonness

Ancestry of “seldomness”, step by step

seldomness traces back through two separate lines of ancestry.

via English seldom

StepLanguageWordMeaning
1EnglishseldomInfrequently, rarely; Rare; infrequent
2Middle EnglishseldomAlternative form of selden; uncommon
3Old Englishseldanseldom, rarely
4Proto-Germanicseldana
5Proto-Germanicseldanēseldom; rarely
6Proto-Germanicseldanazrare, strange

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-Germanic seldanaz