Judgement and conjecture
～に相違ない
there is no doubt that; must be
AI-written, reviewed by AI (ChatGPT)
How to form it
- Noun / Verb (plain form) + に相違ない
- い-adjective + に相違ない
- な-adjective stem + に相違ない
Register: Formal, written
Explanation
Expresses a firm conclusion that something is so, based on evidence. It is a formal version of に違いない.
Typical in reports, legal and news writing. It sounds objective and serious.
Examples
この手紙は彼が書いたものに相違ない。
このてがみはかれがかいたものにそういない。
This letter must have been written by him.
犯人はまだ近くにいるに相違ない。
はんにんはまだちかくにいるにそういない。
The culprit must still be nearby.
これは彼の仕業に相違ない。
これはかれのしわざにそういない。
This is undoubtedly his doing.
Compare with
- ～に違いない: に違いない is the everyday version; に相違ない is formal.
Common mistakes
- Using it in casual speech. It sounds stiff.