| Lingwa de Planeta | art-287 |
| dubi | |
| Sambahsa-mundialect | art-288 | dwoi |
| Deutsch | deu-000 | bedenken |
| Deutsch | deu-000 | zweifeln |
| English | eng-000 | doubt |
| English | eng-000 | question |
| Esperanto | epo-000 | dubi |
| Nederlands | nld-000 | twijfelen |
| Novial | nov-000 | duta |
| русский | rus-000 | сомневаться |