Where does “unfainting” come from?

unfainting (English) comes from English fainting, from Middle English feinting.

unfainting (English): Not fainting

Definitions

  1. Not fainting

Ancestry of “unfainting”, step by step

unfainting traces back through two separate lines of ancestry.

via English fainting

StepLanguageWordMeaning
1Englishfaintingpresent participle of faint; An act of collapsing...
2Middle Englishfeinting—

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Middle English feinting →Every word from English fainting →