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I had no idea vs I hadn't idea

I had no idea vs I hadn't idea 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 had no idea is the most popular phrase on the web.

I hadn't idea

144,700 results on the web

I had no idea

162,300,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • I had no idea that all of it would stay with me.
  • I didn't
  • I didn't
  • I had no idea.
  • I didn't
  • I had no idea that all of it would stay with me.
  • I didn't
  • I had no idea.
  • I had no idea what true power was.
  • And I had no idea so many people suffer from psoriasis.
  • I had no idea you had any directing experience.
  • I had no idea why William was sick.
  • I had no idea you were so arty.
  • Honestly, I had no idea that was going to work.
  • I had no idea that she and Agnes would become such firm friends.
  • And secondly, I had no idea you were married.

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