Where does “infallibleness” come from?

infallibleness (English) comes from English infallible, from Medieval Latin īnfallibilis, from Latin īn-, from Latin în, from Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

infallibleness (English): The quality of being infallible

Definitions

  1. The quality of being infallible

Ancestry of “infallibleness”, step by step

infallibleness traces back through two separate lines of ancestry.

via English infallible

StepLanguageWordMeaning
1EnglishinfallibleWithout fault or weakness; incapable of error or...
2Medieval Latinīnfallibilis
3Latinīn-un-, non-, not
4Latinînin, at, on, upon, from (space)
5Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
6Proto-Italicenin
7Proto-Indo-Europeanh₁énin

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European h₁énEvery word from Latin īn-Every word from Proto-Italic en