| Lingua Franca Nova | lfn-000 |
| seria | |
| English | eng-000 | earnest |
| English | eng-000 | earnestly |
| English | eng-000 | gravity |
| English | eng-000 | responsible |
| English | eng-000 | serious |
| English | eng-000 | seriously |
| English | eng-000 | seriousness |
| English | eng-000 | solemn |
| English | eng-000 | solemnity |
| English | eng-000 | solemnly |
| English | eng-000 | strict |
| English | eng-000 | strictly |