The story
- Proto-Indo-European*per-
- Proto-Indo-European*preh₂-
- Proto-Indo-European*préh₂i?
- Proto-Italic*prai
- Proto-Italic*praiteros
- Latinpraeter
- Englishpreter-
- Proto-Indo-European*h₁én
- Proto-Italic*en
- Proto-Italic*en-
- Latinin-
- Latintendō
- Latinintendō
- Medieval Latinintentiō
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Medieval Latinintentiōnālis
- Englishintentional
- English todaypreterintentional
From preter- (prefix meaning ‘beyond’) + intentional (adjective). Later uses, especially sense 2 (“of a crime: more serious than the lesser crime that the perpetrator intended to commit instead”) are influenced by Portuguese preterintencional, Spanish preterintencional, etc.
Etymology from Wiktionary, CC BY-SA 4.0.