Where does “nonfrivolous” come from?

nonfrivolous (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.

nonfrivolous (English): Not frivolous

Definitions

  1. Not frivolous

Ancestry of “nonfrivolous”, step by step

nonfrivolous 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 frivolous

StepLanguageWordMeaning
1EnglishfrivolousSilly, especially at an inappropriate time or in...
2Latinfrīvolussilly, empty, trifling, frivolous, worthless
3Proto-Indo-EuropeanbʰreyH-to cut
Every word from Proto-Indo-European óynos →Every word from Old Latin noenum →Every word from Latin nōn →