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• don't-know
  don't-know

  noun

  a person who has no opinion or is undecided, as in answering an item on a public-opinion poll.
• don't know
  don't know

  noun

  a person who has not reached a definite opinion on a subject, esp as a response to a questionnaire

don't-know

American  

[dohnt-noh] / ˈdoʊntˈnoʊ /

noun

1. a person who has no opinion or is undecided, as in answering an item on a public-opinion poll.

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don't know British  

noun

1. a person who has not reached a definite opinion on a subject, esp as a response to a questionnaire

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Etymology

Origin of don't-know

First recorded in 1885–90

Example Sentences

See Examples For:

don't know

Don’t let anyone convince you that we don’t know how to shrink America’s persistent academic achievement gap.

From The Wall Street Journal ● Jul. 28, 2026

“I don’t know a single Black girl who hasn’t had a profound connection to ‘Black Girl’s Window,’ ” curator and Saar’s biographer, Zoé Whitley, told The Times in a recent interview.

From Los Angeles Times ● Jul. 28, 2026

Asked why the factory was not ready, given he had been there since 2023, he says, effectively, you only know what you don't know when you discover it.

From BBC ● Jul. 28, 2026

“I don’t know all the details or even how real this is, but if it does happen, I think it’s hard to justify for Nvidia,” he said.

From MarketWatch ● Jul. 27, 2026

I don’t know how he can eat that in this heat.

From "Red Flags and Butterflies" by Sheryl Azzam