Synonyms and related words :
absurdity, equivalent odds, even break, even chance, good chance, hopelessness, hundred-to-one shot, impossibility, impossible, impossibleness, inconceivability, long odds, long shot, not a prayer, odds, oxymoron, paradox, price, self-contradiction, short odds, small chance, square odds, the impossible, unimaginability, unthinkability, what cannot be, what cannot happen