unenforceable

adj. not enforceable, not capable of being enforced

An unenforceable contract or transaction is one that is valid, but which the court will not enforce. Unenforceable is usually used in contradistinction to void (or void ab initio) and voidable. If the parties perform the agreement, it will be valid, but the court will not compel them if they do not.
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Adjective
1. not enforceable; not capable of being brought about by compulsion; "an unenforceable law"; "unenforceable reforms"
(antonym) enforceable

unenforceable /'ʌnin'fɔ:səbl/
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