without fail; undoubtedly; for sure
Expresses strong certainty that something will happen or is true. Often used when the speaker is confident based on evidence or expectation.
He'll definitely come.
With this method, we'll succeed without a doubt.
間違いなく stresses the absence of error or doubt, whereas まさしく emphasizes a strong, almost declarative certainty.
Standard kanji spelling.
Variant using 無 instead of な; less common in modern writing.
Derived from 間違い (mistake) + なく (adverbial form of ない, 'not existing'), literally 'without mistake'.