Where does “unthinkability” come from?

unthinkability (English) comes from English unthinkable, from English Un-, from Middle English un-, from Old English un-, from Proto-West Germanic un-, from Proto-Germanic un-, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

unthinkability (English): The property of being unthinkable

Definitions

  1. The property of being unthinkable

Ancestry of “unthinkability”, step by step

unthinkability traces back through two separate lines of ancestry.

via English unthinkable

StepLanguageWordMeaning
1EnglishunthinkableIncapable of being believed; incredible;...
2EnglishUn-not
3Middle Englishun-
4Old Englishun-negation or absence of: un-, non-; bad; forms...
5Proto-West Germanicun-not, un-
6Proto-Germanicun-not, un-
7Proto-Indo-Europeann̥-not, un-
8Proto-Indo-Europeannenot

via English ity

StepLanguageWordMeaning
1Englishity
2Ingrian-uUsed to form nouns from verbs
Every word from Proto-Indo-European ne
unthinkability — Etymology, Origin & Word History | Etymology Explorer