Where does “unfeignably” come from?

unfeignably (English) comes from English unfeignable, from English feignable, from English able, from Middle English able, from Old French able, from Latin habilis, from Latin -ilis, from Proto-Italic -elis — Forms agent nouns from verbal roots.

unfeignably (English): In an unfeignable manner

Definitions

  1. In an unfeignable manner

Ancestry of “unfeignably”, step by step

unfeignably traces back through two separate lines of ancestry.

via English unfeignable

StepLanguageWordMeaning
1EnglishunfeignableNot feignable
2EnglishfeignableAble to be feigned
3EnglishableEasy to use; Suitable; competent; Liable to
4Middle Englishablecapable, expert, qualified, skilful, competent
5Old Frenchableable; capable
6Latinhabilisable to have/possess/maintain; having sufficient...
7Latin-ilis-ile
8Proto-Italic-elis
9Proto-Indo-European-elis
10Proto-Indo-European-lósForms agent nouns from verbal roots

via English ly

StepLanguageWordMeaning
1EnglishlyAbbreviation of light-year
2VietnameselyAlternative spelling of li
Every word from Proto-Indo-European -lós