Where does “indubitable” come from?

Indubitable comes from Latin indubitabilis, combining the prefix in- (from Latin in, Proto-Indo-European ne, meaning "not") with dubitabilis (doubtful), ultimately from Proto-Indo-European roots en and oyd-.

indubitable (English): clearly true; providing no possibility of doubt;...

Definitions

  1. clearly true; providing no possibility of doubt;...

Ancestry of “indubitable”, step by step

indubitable traces back through two separate lines of ancestry.

via French indubitable

StepLanguageWordMeaning
1Frenchindubitableindubitable
2Late Latinindubitabilis—

via Latin indubitabilis

StepLanguageWordMeaning
1Latinindubitabilis—

Words derived from “indubitable”

Every word from Late Latin indubitabilis →Every word from French indubitable →
indubitable — Etymology, Origin & Word History | Etymology Explorer