1) Imperfect 2) Void 1) Legal terminology 2) Not enforceable 
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. An example of a transaction which is an unenforc...
[adj] - not enforceable
adjective not enforceable; not capable of being brought about by compulsion; `an unenforceable law`; `unenforceable reforms`