Where does “unexorable” come from?

unexorable (English) comes from English exorable, from Latin exorabilis, from Latin exoro, from Latin ōrō, from Latin ōs, from Proto-Italic ōs, from Proto-Indo-European h₃ésth₁ — bone.

Ancestry of “unexorable”, step by step

unexorable traces back through two separate lines of ancestry.

via English exorable

StepLanguageWordMeaning
1EnglishexorableCapable of being moved or persuaded
2Latinexorabilisexorable; persuasive
3LatinexoroI persuade or win over; I beg, plead or entreat
4Latinōrōto orate, deliver a speech publicly
5Latinōsmouth
6Proto-Italicōsmouth
7Proto-Indo-Europeanh₃ésth₁bone

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European h₃ésth₁Every word from Proto-Italic ōsEvery word from Latin ōs