疑いない
うたがいない
expression, i-adjective
undoubted; certain; beyond question
formalevaluation
Conjugation
| Affirmative | Negative | |
|---|---|---|
| Present | 疑いない | 疑いなくない |
| Past | 疑いなかった | 疑いなくなかった |
| て form | 疑いなくて | 疑いなくなくて |
| Adverbial | 疑いなく | — |
| Conditional ば | 疑いなければ | 疑いなくなければ |
| Conditional たら | 疑いなかったら | 疑いなくなかったら |
1.
undoubted; certain; beyond question; indisputable
Expresses that something is certain and cannot be doubted. Often used at the end of a sentence with ～に疑いない or ～は疑いない.
Formed from 疑い (doubt) + ない (not). Literally means "there is no doubt." A common expression for making emphatic assertions.
Common patterns
- ～ことは疑いない: there is no doubt that ~
- ～に疑いはない: there is no doubt about ~
- 疑いなく: undoubtedly (adverbial form)
- 疑いのない事実: an undoubted fact
Similar words
- 間違いない: no mistake, for certain — more colloquial; often used to confirm something is correct
- 確かだ: certain, sure — states certainty without the double-negative emphasis
- 紛れもない: unmistakable, undeniable — emphasizes that there can be no confusion
Register
Slightly formal. Common in written Japanese, speeches, and serious discussion. In casual speech, 間違いない or 絶対 would be more natural.