
In contract law, an illusory promise is one that courts will not enforce. This is in contrast with a contract, which is a promise that courts will enforce. A promise may be illusory for a number of reasons. In common law countries this usually results from failure or lack of consideration (see also consideration under English law). Illusory promis...
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http://en.wikipedia.org/wiki/Illusory_promise

(n) An Illusory Promise is the assurance given by a person or entity to another r person or entity to do or executes an action or activity which is unclear and unspecific or impossible to execute. Eg. Promise to predict the future perfectly in advance.
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http://www.encyclo.co.uk/local/21213

A promise that pledges nothing, because it is vague or because the promisor can choose whether or not to honor it. Such promises do not create contracts and are not legally binding.
Found on
http://www.nolo.com/dictionary/illusory-promise-term.html
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