have no idea

idiom

Definition of have no idea

1 : to not know or understand I have no idea what you're talking about.
2 used to reply to someone as an emphatic "yes""Was it hard?" "You have no idea (how hard it was)!"

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“Have no idea.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/have%20no%20idea. Accessed 21 November 2019.

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