The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Proto-Indo-European*h₁éǵʰ
- Proto-Indo-European*h₁éǵʰs
- Proto-Italic*eks
- Latinex
- Latinex-
- Proto-Indo-European*kap-
- Proto-Indo-European*kapyéti
- Proto-Italic*kapjō
- Latincapiō
- Latinexcipiō
- Latinexceptiō
- Old Frenchexcepcion
- Anglo-Normanexcepcioun
- Middle Englishexception
- Englishexception
- Englishexceptionable
- English todayunexceptionable
From un- + exceptionable.
Etymology from Wiktionary, CC BY-SA 4.0.