The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Italic*n̥-
- Latinim-
- Proto-Indo-European*per-
- Proto-Italic*peri-
- Latinper-
- Proto-Indo-European*dʰeh₁-
- Proto-Indo-European*dʰeh₁k-
- Proto-Indo-European*dʰh₁kyéti
- Proto-Italic*θakjō
- Proto-Italic*fakjō
- Latinfaciō
- Latinperficiō
- Latinperfectus
- Latinimperfectus
- Old Frenchimparfit
- Middle Englishimperfit
- English todayimperfect
From Middle English imperfit, from Old French imparfit (modern French imparfait), from Latin imperfectus. Spelling modified 15c. to conform Latin etymology. See im- + perfect.
Etymology from Wiktionary, CC BY-SA 4.0.