Where does “unascertainably” come from?

unascertainably (English) comes from English unascertainable, from English ascertainable, from English ascertain, from Middle English acerteynen, from Old French acertener, from Old French certain, from Vulgar Latin certanus, from Latin certus — to sift, separate, divide.

unascertainably (English): Such that it cannot be ascertained

Definitions

  1. Such that it cannot be ascertained

Ancestry of “unascertainably”, step by step

unascertainably traces back through two separate lines of ancestry.

via English unascertainable

StepLanguageWordMeaning
1EnglishunascertainableThat cannot be ascertained; uncertain, unable to...
2EnglishascertainableAble to be ascertained
3EnglishascertainTo find out definitely; to discover or establish;...
4Middle Englishacerteynen
5Old Frenchacertenerto assure; to make sure of, to make certain of
6Old Frenchcertaincertain; sure
7Vulgar Latincertanuscertain
8Latincertuscertain; fixed, settled, firm; resolved,...
9Proto-Indo-Europeankrey-to sift, separate, divide

via English ly

StepLanguageWordMeaning
1EnglishlyAbbreviation of light-year
2VietnameselyAlternative spelling of li
Every word from Proto-Indo-European krey-Every word from Latin certusEvery word from Vulgar Latin certanus
unascertainably — Etymology, Origin & Word History | Etymology Explorer