not in a month of Sundays(not) in a month of Sundays
if you say that something will not happen in a month of Sundays, you mean that it is not likely to happen.
He'll never run the marathon, not in a month of Sundays.
not in a month of Sundays
Not at any point; under absolutely no circumstances. Not in a month of Sundays did I think that I would actually win the lottery!A: "Do you think Samantha will agree to go on a date with Jake?" B: "Not in a month of Sundays!"
not in a month of Sundays
or
never in a month of Sundays
If you say that something will not or will never happen in a month of Sundays, you mean it is very unlikely to happen. Their scheme will never work — not in a month of Sundays.