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I don't know either. vs I don't know neither

I don't know either. vs I don't know neither which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

I don't know either. is the most popular phrase on the web.

I don't know neither

1126,000 results on the web

I don't know either.

11,560,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • It doesn't look like this phrase is very popular! The search could not find any examples on the internet.
  • I don't know either.
  • That, I don't know either.
  • Sure. I don't know either.
  • No, I don't know either.
  • I don't know either.
  • I don't know either.
  • I don't know either.
  • Well, the answer is, I don't know either.

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