疑いない
うたがいない
expression, i-adjective
undoubted; certain; beyond question
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}.
彼が犯人であることは疑いない。
There is no doubt that he is the culprit.
この技術が社会を変えることは疑いない。
There is no doubt that this technology will change society.
彼女の才能は疑いないが、経験がまだ足りない。
Her talent is beyond question, but she still lacks experience.
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 EXPRESSIONS:
- 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.