Grammar Info

N2 Lesson 1: 13/23

に相違(そうい)ない

Without a doubt, Certainly, Surely, Not mistaken

Structure

Verb + （から）+ に相違(そうい)ない
［い］Adjective + （から）+ に相違(そうい)ない
［な］Adjective + （である(1)）+ に相違(そうい)ない
Noun + （である(1)）+ に相違(そうい)ない

(1) であるから

Details

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    Formal

About に相違ない

In a similar fashion to に違(ちが)いない, に相違(そうい)ない is a structure that firmly states that something is 'without a doubt (A)', or that there is 'no mistaking (A)'. It may be used to strengthen one's own opinions, or to strongly agree with the opinion of another. Although 相違(そうい) may be used by itself meaning 'to differ', or 'to have a discrepancy', 相違(そうい)ない is considered as a set い-Adjective. When combined with ない, the literal meaning is just 'there is no discrepancy in (A)'.

に相違(そうい)ない may be used with verbs, い-Adjectives, な-Adjectives and nouns.

に相違ない will often follow から, highlighting that there is no mistaking the 'cause' of (A).

Caution

This grammar structure is very formal, with に違(ちが)いない almost always being used in its place.

Examples

--:--

    田中(たなか)先生(せんせい)は一流(いちりゅう)の外科(げか)医(い)だから、手術(しゅじゅつ)は成功(せいこう)するに相違(そうい)ない。

    Doctor Tanaka is a first-class surgeon, so the surgery will be successful without a doubt.

    報告(ほうこく)によると、この新(あたら)しいウイルスは空気(くうき)を介(かい)して広(ひろ)がるに相違(そうい)ない。

    According to the report, this new virus is, without a doubt, spreading through the air.

    記者(きしゃ)：「首相(しゅしょう)は来年(らいねん)減税(げんぜい)をすると言(い)ったから、グレーゾーンを減(へ)らそうとするに相違(そうい)ない。」

    Reporter: 'The prime minister said that he will reduce taxes next year, so he will without a doubt attempt to reduce the gray zone.'

    検察官(けんさつかん)：「被害(ひがい)者(しゃ)の死因(しいん)は鉄(てつ)パイプのようなもので殴(なぐ)りつけられたからに相違(そうい)ない。」

    Public prosecutor: 'It is certain that the cause of the victim's death was a blow from something like an iron pipe.' (without a doubt)

    課長(かちょう)：「競合(きょうごう)他社(たしゃ)は何(なに)か魂胆(こんたん)があるに相違(そうい)ない。」

    Section manager: 'Competitors are surely plotting something.' (without a doubt)

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