| 1 | Latin | perpetualis | that holds everywhere, universal, general |
| 2 | Latin | perpetuus | perpetual, continuous, uninterrupted, constant,... |
| 3 | Latin | -uus | forms adjectives on verbal stems |
| 4 | Proto-Italic | *-wos | — |
| 5 | Proto-Indo-European | -wós | Creates adjectives from verb stems |