# have no idea

idiom · CEFR B1

Source: https://englishreference.com/idiom/have-no-idea
Updated: 2026-04-22

## Meaning

to not know something at all; you use this when you are completely unsure about a fact or a situation.

## Examples

- I have no idea where my keys are.
- When the teacher asked about the complex math problem, the entire class admitted they had no idea how to solve it.
- Despite his years of experience in the field, he confessed he had no idea why the system failed so suddenly during the final presentation.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.