10 Ways To Say I don’t Know

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  • Post last modified:29/09/2022
  • Post category:Everyday English
  • Reading time:10 mins read

Learn 10 ways to say I don’t know in English. It’s important to boost your vocabulary with new words and phrases and avoid repetition. 

Learn different ways to say “I don’t know” in English and sound more like a native speaker.

Listen to the podcast Speak Better English with Harry or watch it on YouTube at Learn English with Harry. englishclass101

Better Ways to say I don't know



Harry is a native English teacher with over 10 years of experience both online and in face-to-face lessons. With his extensive experience in business, he specialises in Business English but happily teaches ESL students with any English learning needs.

10 ways to say I don't know in English

Hi there, this is Harry and welcome back to my English lessons. Today, we’re going to look at some different ways in which you can say ‘I don’t know’. So I’ll give you 10 ways to say I don’t know in English.

Of course, you can just shrug your shoulders and that often works.

But there are times when you need to use more words and phrases. And perhaps you can’t shrug your shoulders when you’re talking to your boss.

The first one we can say is:

I have no idea


I have no idea where your order is. I need to go and check.

I have absolutely no idea what you’re talking about!

I have no idea where you left your wallet.

The second option I have for you is

I haven’t the foggiest

Meaning you don’t know, you can’t see the solution in front of you.

It’s an unusual word and I’m sure there are many of you out there that have never heard of the word ‘foggiest’. But I’m sure you heard of the word ‘fog’. In October and November, we get warm days and cold nights and when you wake up in the morning, you’ve got some fog that you can’t really see through. So this is what we mean when you haven’t the foggiest.


I haven’t the foggiest what to do for my husband’s 30s. He doesn’t want a party.

Emma’s got skis and not the foggiest what to do with them!

To be honest with you, I haven’t really got the foggiest of what to do next.

10 ways to say I don't know in English

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The third choice is connected with the word clue. And we can use this in different ways. We can say

I have no clue/ I haven’t a clue or I’m clueless

They really all mean the same thing.


I have no clue what to do with this order, we somehow need to sort out this mess.

I’m absolutely clueless about what to give my mother for Christmas.

I haven’t a clue where your keys are.

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And the next one I have for you is 

your guess is as good as mine

We will use it in a more informal way.


Daniel is really struggling with maths. We don’t seem to be able to help him.

Oh, your guess is as good as mine. What can we do? We’ve tried everything.

The next expression we use is

it beats me

Meaning I am really struggling to find an answer to it


It really beats me how she got this promotion.

It beats me how this programme works.

10 ways to say I don't know in English

Number six on the list is

don’t ask me

This is informal and quite funny way to say ‘I don’t know’.


Don’t ask me, I haven’t seen Jack since March.

Number seven on the list is

I’m not sure

This is the best answer to give in a situation when you have some idea but not 100% sure.


What do you think of Mark’s report?

Well, I’m not sure, I don’t know whether that what’s the boss wants to see.

Number eight is

that’s a good question

This is a perfect way to say ‘I don’t know’ when you don’t want to say that you really don’t know the answer. If you ever see politicians interviewed, this is the answer they use when they’re stuck.


When will the hospital be finished?

That’s a good question.

10 ways to say I don't know in English

English Vocabulary: 10 Ways to say I don't know in English. From intermediate to advanced English with www.englishlessonviaskype.com #learnenglish #englishlessons #EnglishTeacher #vocabulary #ingles #อังกฤษ #английский #aprenderingles #english #cursodeingles #учианглийский #vocabulário #dicasdeingles #learningenglish #ingilizce #englishgrammar #englishvocabulary #ielts #idiomas

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Number nine is very formal

I’ll look into it and get back to you

We use this expression when we really don’t want the other person to know that we have no clue what they’re talking about.


What is the sales figure for the month?

I’ll look into it and get back to you.

And the last one, number ten is

who knows / how would I know

This slightly rhetorical way to say ‘I don’t know’ in English.


Since she hasn’t studied at all I don’t think she’ll pass the test, but who knows?

Who knows? They never tell me anything. They were here earlier. How would I know?

10 ways to say I don't know in English

So these are all the ways to say I don’t know:

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more information

For more information on English grammar rules, English collocations and English idioms, check out the links below:

Phrasal verbs related to decisions

How to start a business meeting in English

You can always study English advanced level at Learning English with the BBC and British Council Learn English.

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