Where does “unhardenable” come from?

unhardenable (English) comes from English hardenable, from English able, from Middle English able, from Old French able, from Latin habilis, from Latin -ilis, from Proto-Italic -elis, from Proto-Indo-European -elis — Forms agent nouns from verbal roots.

unhardenable (English): Not hardenable

Definitions

  1. Not hardenable

Ancestry of “unhardenable”, step by step

unhardenable traces back through two separate lines of ancestry.

via English hardenable

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

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European -lósEvery word from Latin -ilisEvery word from Latin habilis