| 1 | Latin | impervius | impassable; impervious |
| 2 | Latin | pervius | Having a passage through; passable, traversable,... |
| 3 | Latin | per | through, by means of; throughout, during |
| 4 | Latin | Ad | — |
| 5 | Latin | illic | he, she, it, yonder, that, overthere; in that... |
| 6 | Latin | ille | that; those; "; demonstrative pronoun "; that... |
| 7 | Latin | olle | Archaic form of ille |
| 8 | Proto-Italic | *olnos | — |