JLPT N3 Intermediate

違いない

It must be; without a doubt.

Readings

Grammatical Expression / Phrase

It must be..." / "I'm certain that...

Expresses a high degree of certainty based on the speaker’s subjective conviction or logical deduction.

Good to know

違いない（ちがいない） literally means “there is no mistake.” It expresses strong personal certainty, like “it must be…” or “I’m sure that…”

Use it when you feel confident something is true, but you have not directly confirmed it. It sounds stronger than だろう and more assertive than a simple guess.

Grammar pattern:

Verb plain form + 違いない
い-adjective + 違いない
Noun + に違いない（にちがいない）
な-adjective + に違いない

Compared with はず, 違いない focuses more on your confidence or impression. はず often sounds like an expectation based on logic, rules, or known facts.

In casual speech, 絶対（ぜったい） often gives a similar feeling of certainty, but 違いない sounds more like a firm conclusion.

Example

部屋の電気がついている。誰かいるに違いない。

The light in the room is on. Someone must be in there.

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VOCAB 2 / 30

違いない

ちがいない

It must be; without a doubt.

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