a situation in which it is impossible to say which of two things existed first and which caused the other.

It's a chicken and egg situation - I don't know whether I was bad at the sciences because I wasn't interested in them or not interested in them and therefore not good at them.

• not have a monopoly on something
• not have a pot to piss in
• not have a prayer
• not have a snowball's chance in hell
• not have a type of bone in body
• not have a type of bone in your body
• not have much going for
• not have much going for you
• not have much time
• not have much time someone
• not have much time something
• not have the faintest
• not have the faintest idea
• not have the foggiest idea
• not have the foggiest notion
• not have the heart
• not have the heart to
• not have the heart to do something
• not have the stomach
• not have the stomach for
• not have the stomach for something
• not have two pennies to rub together
• nothing but
• nothing but something
• nothing daunted