Where does “unimpregnable” come from?

unimpregnable (English) comes from English impregnable, from English impregnate, from Latin impraegnatus, from Latin impraegno, from Latin īn-, from Latin în, from Latin en, from Proto-Italic en — in.

unimpregnable (English): Not impregnable; capable of being pierced or...

Definitions

  1. Not impregnable; capable of being pierced or...

Ancestry of “unimpregnable”, step by step

unimpregnable traces back through two separate lines of ancestry.

via English impregnable

StepLanguageWordMeaning
1EnglishimpregnableToo strong to be penetrated; Capable of being...
2EnglishimpregnateTo cause to become pregnant; To fertilize; To...
3Latinimpraegnatusmade pregnant
4LatinimpraegnoI impregnate; I make pregnant
5Latinīn-un-, non-, not
6Latinînin, at, on, upon, from (space)
7Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
8Proto-Italicenin
9Proto-Indo-Europeanh₁énin

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European h₁énEvery word from Latin īn-Every word from Proto-Italic en