The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Italic*n̥-
- Latinin-
- Proto-Indo-European*ḱe?
- Proto-Indo-European*ḱóm
- Proto-Italic*kom
- Proto-Italic*kom-
- Latincon-
- Proto-Indo-European*per-
- Proto-Indo-European*preh₂-
- Proto-Indo-European*préh₂i?
- Proto-Italic*prai
- Proto-Italic*prai-
- Proto-Indo-European*gʰed-
- Proto-Indo-European*gʰnédti
- Proto-Italic*hendō
- Proto-Italic*praiɣendō
- Latinprehendō
- Latincomprehendō
- Latincomprehēnsibilis
- Latinincomprehēnsibili
- Middle Frenchincomprehensible
- Englishincomprehensible
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- English todayincomprehensibly
From incomprehensible + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.