Like say if I ask someone what’s are you using that for and they say guess I’m looking for a good idiom that indicates I’m not interested in guessing like “I’m not a mind reader” springs to mind, but does anyone have any others similar to this ?

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It's not an idiom really, but you can always say "I give up". What's nice about this is that it's polite and non-confrontational.

For example:

"[...] Guess what?"
"I give up?"
Alien Ice

“Well, guess who I met there?”
“I give up.”
“Russell Canton.”
Why Did She Have to Die?

Not much of an idiom, but perhaps "I'm in no mood for games."?

  • This makes sense, but sounds a little formal. Perhaps "Not in the mood." instead? – Freddie R Oct 11 at 11:50
  • @FreddieR - I would not take this as formal. – Jim Oct 11 at 17:45

I usually say "Can't be arsed", but again that's not an idiom.

Edit: I've just been corrected. It indeed is an idiom! Sorry, my bad

  • 1
    Seems like an idiom to me! And probably my choice too. Well, in my case "cba mate". – Lightness Races in Orbit Oct 11 at 10:01
  • 1
    Apparently this is a British English idiom (e.g., Where does “can't be arsed” come from?), but certainly not US or Canadian idiom, where "can't be assed" doesn't quite click. – David Hammen Oct 11 at 11:30
  • Mhmm, my bad. I've been using it since ages without realising it's an idiom. Thank you ! – ritu modi Oct 11 at 12:19

"I don't know, what?" (Insert when, who, why, where as appropriate).

This usually cuts the guessing short and gets straight to the question without being rude, and also acknowledging that you are unable to guess, which may well be why the question is asked in the first place.

I have no idea. That's the most used idiom for this situation. It implicitly means you don't know and don't want to guess.

TFD(idiioms):

have no idea

To not be aware of or know more information about something.

A: "Is Sally off today?" B: "Oh, I have no idea. Ask Elaine, she'll know."

Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Depending on how snarky you wanted to be, you could go with

I could care less, but I'd have to try really hard

No.

Possibly a little harsh depending on your tone (maybe that's what you want?) but the simplest response:

Them: Can you guess what I'm doing/thinking?

You: No.

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