〜に相違ない: meaning and usage

How to form it

• verb (plain form)/い-adjective+に相違ない
• noun/な-adjective (stem)+に相違ない

How it is used

States a confident conclusion drawn from evidence: 'must be', 'without a doubt'. It means the same as 「〜に違いない」 but is stiffer and more written, found in essays and reports rather than conversation.

Examples

1. あの事件以来、株価暴落。あの会社は上場廃止になるに相違ないね。

   Since that incident, the stock price has plummeted. That company will be delisted without a doubt.

2. 部屋の電気がついている。彼はまだ起きているに相違ない。

   The light in his room is on. He must still be up.

3. この字は父が書いたものに相違ない。

   This handwriting is without doubt my father's.