Where does “mercurialness” come from?

mercurialness (English) comes from English Mercurial, from Middle English mercurial, from Latin Mercurialis, from Latin Mercurius, from Latin merx, from Proto-Italic *merks.

mercurialness (English): Quality of being mercurial; mercuriality

Definitions

  1. Quality of being mercurial; mercuriality

Ancestry of “mercurialness”, step by step

mercurialness traces back through two separate lines of ancestry.

via English Mercurial

StepLanguageWordMeaning
1EnglishMercurialAny of the plants known as mercury, especially the annual mercury or French mercury (Mercurialis annua)
2Middle EnglishmercurialA plant belonging to the genus "Chenopodium"; a...
3LatinMercurialispertaining to the Roman god Mercury
4LatinMercuriusMercury; a Roman god associated with speed and...
5Latinmerxmerchandise, commodity; goods, wares
6Proto-Italic*merks

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-Italic *merksEvery word from Latin merxEvery word from Latin Mercurius
mercurialness — Etymology, Origin & Word History | Etymology Explorer