you have no idea

phrase

—used to emphasize an agreement with something just said

"Was it hard?" "You have no idea (how hard it was)!"

Cite this Entry

Style

“You have no idea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%20have%20no%20idea. Accessed 15 Mar. 2026.

Copy Citation

Popular in Grammar & Usage

More Words You Always Have to Look Up

5 Verbal Slip Ups and Language Mistakes

Is it 'nerve-racking' or 'nerve-wracking'?

The Difference Between 'i.e.' and 'e.g.'

Democracy or Republic: What's the difference?

Popular in Wordplay

you have no idea

phrase

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

tranche

Popular in Grammar & Usage

More Words You Always Have to Look Up

5 Verbal Slip Ups and Language Mistakes

Is it 'nerve-racking' or 'nerve-wracking'?

The Difference Between 'i.e.' and 'e.g.'

Democracy or Republic: What's the difference?

Popular in Wordplay

The Opposite of Déjà Vu

The Words of the Week - Mar. 13

Was 'nervous Nellie' a Real Person?

Why do we call it a 'flea market'?

17 Words for Dog Breeds

Popular

More Words You Always Have to Look Up

The Opposite of Déjà Vu

The Words of the Week - Mar. 13

Games & Quizzes