Where does “nonmercurial” come from?

nonmercurial (English) comes from English non, from French non, from Old French non, from Latin nōn, from Old Latin noenum, from Proto-Indo-European óynos — one; single.

nonmercurial (English): Not mercurial; not containing or relating to...

Definitions

  1. Not mercurial; not containing or relating to...

Ancestry of “nonmercurial”, step by step

nonmercurial traces back through two separate lines of ancestry.

via English non

StepLanguageWordMeaning
1EnglishnonObsolete form of none
2Frenchnonno; not; a no, a negative response
3Old Frenchnonno; not; Alternative form of nom
4Latinnōnnot
5Old Latinnoenum
6Proto-Indo-Europeanóynosone; single

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
Every word from Proto-Indo-European óynosEvery word from Old Latin noenumEvery word from Latin nōn