be a million miles away

1. To be very far away. Used hyperbolically. A: "Come on, let's walk to school today instead of driving." B: "Ugh, Mom! School is, like, a million miles away! My kids always act like their hamper is a million miles away and they can't be bothered to put their clothes in it. Come on, the store isn't a million miles away. Please go and get us some milk.

2. To be noticeably distracted, unfocused, or lost in thought. Sorry, I was a million miles away just now. Could you say that again? Are you even listening to me? You seem like you're a million miles away. Of course you don't remember me saying that—you were a million miles away the whole time!

3. To be extremely dissimilar (to something). Typically used in negative constructions. Your answer isn't quite right, though it isn't a million miles away. This laptop isn't a million miles away from the top-end computers, and it's much more affordable. This house isn't a million miles away from what we're looking for, but it sure would need a lot of cosmetic changes.