Synonyms for the popular phrase "snowball's chance in hell" - meaning something highly unlikely to happen - include "slim to none," "wishful thinking," "long shot," "never gonna happen," "pie in the sky," "unrealistic," "futile," "impossible," "outlandish," and "unattainable." Other similar expressions might include "uphill battle," "against all odds," "chasing a dream," "grasping at straws," or "whistling in the wind." No matter which words you choose, the meaning remains the same: the likelihood of success is virtually nonexistent. It's important to keep these expressions in mind when setting realistic goals and managing expectations.