The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Englishvalue
- Englishvaluable
- English todayunvaluable
From un- + valuable. Piecewise doublet of invaluable.
First known use, by meaning
- from 17th c. Not valuable; having little value.
- 16th–18th c. Invaluable; beyond price.
Etymology from Wiktionary, CC BY-SA 4.0.