Translation guide
To say something is undeniably true means it cannot be denied or disputed. In Japanese, this is expressed through adverbs, set phrases, and sentence-ending patterns that emphasize certainty or obviousness.
Expressing that something is clearly true and cannot be denied.
The most common and versatile way to say 'undeniably' or 'without a doubt'. Used in both spoken and written Japanese.
彼は間違いなくこの分野の専門家だ。
He is undeniably an expert in this field.
A formal phrase meaning 'there is no room for doubt'. Suitable for written or formal contexts.
Adding force to a claim, often in argument or persuasion.
A sentence-ending pattern meaning 'must be' or 'no doubt'. Conveys strong conviction.
彼は真実を知っているに違いない。
He undeniably knows the truth.
Direct translations like '否定できないほど' are unnatural. Use the adverbs and patterns above instead.
His success is undeniably true.
Means 'clearly' or 'obviously'. Often used when the evidence is visible or apparent.
明らかに彼女の方が上手だ。
She is undeniably better.
Literally 'cannot be denied'. Used as a predicate or modifier.
その事実は否定できない。
That fact is undeniable.
Means 'certainly' or 'surely'. Often used to concede a point before adding a contrasting statement.
確かに彼の言う通りだ。
He is undeniably right.
A more casual and emphatic pattern meaning 'it's obvious that' or 'of course'. Common in spoken Japanese.
そんなの嘘に決まっている。
That's undeniably a lie.