The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Italic*n̥-
- Latinin-
- Proto-Indo-European*trep-
- Proto-Indo-European*dʰeh₁-
- Latintrepidus
- Latinintrepidu
- Frenchintrépide
- English todayintrepid
From French intrépide, from Latin intrepidus, from in- (“not”) + trepidus (“anxious, nervous”).
Etymology from Wiktionary, CC BY-SA 4.0.