I have no idea or I have no clue?


What is the difference?

You can use both I have no clue and I have no idea to express that you have no information/knowledge about something. They mean the same thing.

The only difference may be that the word clue is a little bit more informal than the word idea. Although you should not use either expression in a formal situation as they don’t sound very polite.

  • When do you think Brad will get here?
  • I have no idea.
  • I have no clue.

The above dialogue is likely to take place between friends or colleagues. However, if you are in a more formal situation, such as an important meeting or interview, try to use different words. For example:

  • When do you think we will start?
  • I’m afraid, I’m not sure.
  • I’m sorry, I don’t know.

If you would like to learn some useful expressions you can say when you do not know the answer to a question, read Other Ways to Say β€œI don’t know”.

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