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Where does “unpropitious” come from?

I notice this chain appears problematic—it begins with "propitious" (meaning favorable) but then jumps backward through "unus" (one), "óynos" (one), and roots like "bʰuH-" and "per-" that don't clearly connect to "propitious" semantically or etymologically. Before I write the summary sentence, I need to flag: Does this chain actually derive "unpropitious"? The standard etymology of "propitious" traces to Latin *propitius* (favorable), not *unus* (one). Could you clarify: 1. Is this chain meant to derive "unpropitious" or a different word? 2. Are there any errors in the chain as provided? A sentence built on an unreliable chain would violate the accuracy requirement. I want to ensure I'm working from correct data before composing.

unpropitious (English): not propitious; unfavourable, untimely

Definitions

  1. not propitious; unfavourable, untimely

Ancestry of “unpropitious”, step by step

StepLanguageWordMeaning
1EnglishpropitiousFavorable; benevolent; Advantageous;...
2Old Frenchpropiciusmerciful
3Latinpropitiusfavorable, well-disposed, kind; propitious
4Latinprō-—
5Proto-Italic*pro-—
6Proto-Indo-Europeanpro-toward, forward
7Proto-Indo-Europeanpor-to give birth; forward, through; going, passage
8Proto-Indo-Europeanper-before, in front; first; to go through
9Proto-Indo-Europeanpr̥tóspassed , crossed

Words derived from “unpropitious”

  • unpropitiously
  • unpropitiousness
Every word from Proto-Indo-European pr̥tós →