Do に違いない and きっと～でしょう have the same meaning and usage? I learned that に違いない is
based on feeling of the speaker, but I couldn't find what きっと～でしょう is based
on. So I'm wondering if きっと～でしょう is based on logic or feeling just like に違いない?
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2021-10-05T17:14:03.040
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question
grammar
What is the difference between に違いない and きっと～でしょう?
Both describe almost same degree of high certainty.

~に違いない implies it is highly likely to be something in an assertive, conclusive
sense.

きっと～でしょう also implies it is highly likely to be something
generally/objectively/ speaking.

Both are kind of a subjective assumption. ~に違いない sounds more definitive than
きっと～でしょう.

For example, if weather forecaster says it will be a heavy rain tomorrow due
to typhoon approaching, 明日は大雨に間違いなくなるでしょう。 sounds more natural than
明日は大雨にきっとなるでしょう。 .
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2021-10-06T00:12:41.157
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answer
I see two differences. Basically きっと is even more subjective.

  * きっと is typically used to describe a _desirable_ outcome. きっと失敗するだろう is grammatical but this can sound you are hoping someone will fail. 失敗するに違いない is neutral in this regard.
  * きっと tends to be used when you say something based on your subjective/personal expectation rather than an objective estimation. Saying きっとうまくいくよ ("It's gonna be fine") to encourage someone is usually safe even when the objective chance of success is 50%. Saying うまくいくに違いない in a situation like this can sound irresponsible.
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answer