The story
- Proto-Indo-European*úp
- Proto-Indo-European*upér
- Proto-Germanic*uber
- Old Englishofer-
- Middle Englishover-
- Englishover-
- Proto-Indo-European*h₁ep-
- Proto-Indo-European*h₁éps
- Proto-Indo-European*h₁épi
- Latinoptimus
- Frenchoptim(isme)
- Frenchoptimiste
- Englishoptimist
- Englishoptimistic
- English todayoveroptimistic
From over- + optimistic.
Etymology from Wiktionary, CC BY-SA 4.0.