Strong Certainty: 〜に違いない
Learn how 〜に違いない expresses a strong conclusion or firm certainty based on evidence or conviction.
Core Meaning
〜に違いない means 'must be' or 'there is no doubt that....' It expresses stronger confidence than ようだ or かもしれない.
あの店は行列ができている。おいしいに違いない。
That restaurant has a line. It must be good.
The speaker draws a strong conclusion from evidence.
電気が消えているから、もう寝たに違いない。
The lights are off, so he must have gone to bed already.
The speaker sounds highly certain.
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