| 1 | Latin | nubilare | present active infinitive of nūbilō; to cloud |
| 2 | Latin | nubilo | I am or become cloudy or overcast; I become... |
| 3 | Latin | nubilus | cloudy, overcast; cloud-bringing; dark, gloomy,... |
| 4 | Latin | nubes | cloud; swarm, multitude; phantom, something... |
| 5 | Proto-Indo-European | (s)newdʰ- | to cover |