に相違ない
🃏 Flashcard
に相違ない
ni soui nai
Tap to reveal usage
without a doubt; certain; sure
N2
Tap to test your recall · +10 XP
📊 Pattern Stats
JLPT Level
N2
Upper-Intermediate · Academic & formal usage
Reading
ni soui nai
Post ID
51101
Patterns today
0
0 / 10 daily goal
📝 Usage Notes
without a doubt; certain; sure
📖 How to use it
Expresses strong conviction that something is certainly true, without a doubt.
Attaches to
Attach to the plain form of verbs, adjectives, or the copula だ (which becomes である) for nouns and な-adjectives. For nouns and な-adjectives, use であるに相違ない. For verbs and い-adjectives, use the plain present or past form.
This pattern is a formal, written expression used to assert that something is certainly the case. It is stronger than に違いない and carries a sense of logical conclusion or firm belief. In conversation, it sounds stiff, so it is mostly found in essays, reports, or formal speeches. For example, if you see dark clouds, you might say '雨が降るに相違ない' (It will certainly rain). The pattern attaches to the plain form: for verbs, use the dictionary form or past tense; for い-adjectives, the plain form; for nouns and な-adjectives, use である instead of だ.
彼はその知らせを聞いて驚いたに相違ない。
Kare wa sono shirase o kiite odoroita ni soui nai.
He must have been surprised to hear that news.
この計画は成功するに相違ない。
Kono keikaku wa seikou suru ni soui nai.
This plan is certain to succeed.
あの店の料理はおいしいに相違ない。
Ano mise no ryouri wa oishii ni soui nai.
The food at that restaurant is undoubtedly delicious.
Not に違いない
Both mean 'certainly', but に相違ない is more formal and literary, often used in written language, while に違いない is common in both speaking and writing.
Register
Formal, written; rarely used in casual conversation.
🎯 Quick Quiz
What does this grammar pattern mean or do?
に相違ない
📚 How to Master This Pattern
Say It Aloud
Press Hear it and repeat に相違ない three times. Feel the rhythm — grammar patterns have a natural flow.
Flip Before Reading
Always try to recall the usage before flipping the card. Struggle = learning. Every failed recall makes the next one stick harder.
Write Two Sentences
Compose two original sentences using に相違ない. One about yourself, one about something you see right now.
Spaced Review
Save this pattern and revisit at 10 min, 1 day, 3 days. Production (writing) beats recognition for grammar.
🔗 More JLPT N2 Patterns
❓ Frequently Asked Questions
What does the grammar pattern に相違ない mean?
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Without a doubt; certain; sure
What JLPT level is に相違ない?
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Nihoner currently groups this pattern under JLPT N2 — Upper-Intermediate · Academic & formal usage. Use the level label as study guidance rather than a prediction of what will appear on an exam.
How do you use に相違ない in a sentence?
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Attach に相違ない (ni soui nai) to the appropriate verb or noun form as described in the usage notes. Then try writing two original sentences — one about yourself and one about something around you.
Is に相違ない formal or casual Japanese?
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に相違ない is used in formal or written contexts. You will see it mainly in written texts, news, business Japanese and academic contexts.
How can I remember に相違ない long-term?
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Use the flashcard on this page for active recall — see the pattern, reconstruct the usage from memory, then flip. Follow with the 4-choice quiz to distinguish it from similar patterns. Review later the same day and again over the following days. Writing original sentences can help you practise using the pattern in context.