The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Englishconstitutional
- English todayunconstitutional
From un- + constitutional.
First known use, by meaning
- 18th C. Contrary to or violative of the constitution of a state or other sovereign institution.
Etymology from Wiktionary, CC BY-SA 4.0.