Illusory Promise Legal Meaning and Definition

Here is a simplified definition of the legal term Illusory Promise.

Illusory Promise (noun)

An illusory promise is a promise that someone makes, but this promise is either too vague, not certain, or impossible to fulfill. This kind of promise doesn't legally bind the person who made it because legally, it's not considered a real promise. An example would be someone promising to predict the future with 100% accuracy.