not have a snowball's chance in hell
to have no chance of succeeding:
- impossibleThere's no way we'll be able to get the paperwork done in time – it's impossible.
- unachievableThere is no point in setting unachievable goals for yourself.
- unattainableThese bodybuilders are chasing an unattainable ideal – they'll never be as muscular as they want.
- unfeasibleIt would be unfeasible to try to ban all petrol vehicles at the moment.
- infeasibleThe company has promised a fully self-driving car in a year, but engineers say it is technically infeasible.
