Where does “indubiously” come from?

indubiously (English) comes from English indubious, from Latin indubius, from Latin īn-, from Latin în, from Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

indubiously (English): Synonym of without a doubt

Definitions

  1. Synonym of without a doubt

Ancestry of “indubiously”, step by step

StepLanguageWordMeaning
1EnglishindubiousNot dubious or doubtful; certain; Not doubting;...
2Latinindubiuscertain, not in doubt
3Latinīn-un-, non-, not
4Latinînin, at, on, upon, from (space)
5Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
6Proto-Italicenin
7Proto-Indo-Europeanh₁énin
Every word from Proto-Indo-European h₁én →Every word from Latin īn- →Every word from Proto-Italic en →