Translation guide
This phrase expresses a very high likelihood that something will happen or is true. In Japanese, it is often conveyed through adverbs, sentence-ending expressions, or conditional patterns rather than a single fixed phrase.
To say that something is almost certain to happen or be the case, based on reasoning or common sense.
A common adverb meaning 'probably' or 'likely'. It can be used in both spoken and written Japanese. Often paired with だろう/でしょう.
In all probability, he won't come.
Literally 'eight or nine out of ten', this phrase emphasizes a very high probability. Slightly more emphatic than 恐らく.
In all probability, it will rain tomorrow.
A grammar pattern meaning 'must be' or 'no doubt'. It expresses strong conviction based on evidence or logic.
In all probability, he will succeed.
Indicates an expectation based on reasoning. It translates to 'should' or 'ought to' and implies high probability.
In all probability, he knows.
An adverb meaning 'surely' or 'certainly'. Often used in everyday speech to express strong belief or expectation.
In all probability, it'll be fine.
To express that, given the circumstances, something is almost certainly true or will happen.
To sound natural, pair probability adverbs like 恐らく or きっと with だろう (casual) or でしょう (polite). Using them without a conjectural ending can sound abrupt.
恐らく is more objective and based on reasoning, while きっと is more subjective and emotional, often used to reassure or express hope.
In all probability, he will win.