| 1 | Spanish | lerdo | slow, sluggish, of animals; dim-witted, oafish,... |
| 2 | Late Latin | lurdus | slow; stupid; slow, heavy; clumsy, stupid |
| 3 | Latin | luridus | pale yellow, wan, sallow, lurid; ghastly,... |
| 4 | Latin | luror | paleness, pallor, lividness |
| 5 | Proto-Italic | *loiros | — |