Where does “nonagreeable” come from?

nonagreeable (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.

nonagreeable (English): Disagreeable; unpleasant; displeasing

Definitions

  1. Disagreeable; unpleasant; displeasing

Ancestry of “nonagreeable”, step by step

nonagreeable 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 agreeable

StepLanguageWordMeaning
1EnglishagreeablePleasing, either to the mind or senses; pleasant;...
2Middle EnglishagreableNice, charming, attractive, agreeable; Decent,...
3Old Frenchagreableagreeable; pleasant; pleasing
Every word from Proto-Indo-European óynosEvery word from Old Latin noenumEvery word from Latin nōn