| Papiamentu | pap-000 |
| serio | |
| català | cat-000 | seriós |
| dansk | dan-000 | alvorlig |
| Deutsch | deu-000 | ernst |
| Deutsch | deu-000 | ernsthaft |
| Deutsch | deu-000 | gesetzt |
| English | eng-000 | earnest |
| English | eng-000 | grave |
| English | eng-000 | meaningful |
| English | eng-000 | reliable |
| English | eng-000 | serious |
| English | eng-000 | solemn |
| English | eng-000 | staid |
| Esperanto | epo-000 | serioza |
| føroyskt | fao-000 | álvarsamur |
| suomi | fin-000 | vakava |
| français | fra-000 | sérieux |
| Frysk | fry-000 | earnstich |
| íslenska | isl-000 | alvarlegur |
| italiano | ita-000 | serio |
| Nederlands | nld-000 | bona fide |
| Nederlands | nld-000 | ernstig |
| Nederlands | nld-000 | serieus |
| Nederlands | nld-000 | stemmig |
| bokmål | nob-000 | alvorlig |
| polski | pol-000 | poważny |
| português | por-000 | grave |
| português | por-000 | sisudo |
| português | por-000 | sério |
| română | ron-000 | serios |
| español | spa-000 | formal |
| español | spa-000 | serio |
| svenska | swe-000 | allvarlig |
| Türkçe | tur-000 | ağırbaşlı |