| euskara | eus-000 |
| dudazko | |
| English | eng-000 | doubtful |
| English | eng-000 | dubious |
| English | eng-000 | insecure |
| English | eng-000 | problematical |
| English | eng-000 | questionable |
| English | eng-000 | shaky |
| English | eng-000 | uncertain |
| English | eng-000 | unsure |
| euskara | eus-000 | ezbaiko |
| euskara | eus-000 | eztabaidagarri |
| euskara | eus-000 | zalantzagarri |
| euskara | eus-000 | zalantzazko |