Where does “unfightable” come from?

unfightable (English) comes from English fightable, 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.

unfightable (English): That cannot be fought

Definitions

  1. That cannot be fought

Ancestry of “unfightable”, step by step

unfightable traces back through two separate lines of ancestry.

via English fightable

StepLanguageWordMeaning
1EnglishfightableAble to be fought; Capable in combat
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