Answers: unenforceable contract
for a contract to be enforecable must be
-by people of legitimate age (no minors)
-people of sound mind (bush irrelevant to sign contracts)
-consideration must be involved (even if minute amouint i.e "peppercorn rentals")
-must be for legal activitys (you cant enforce a mafia hit contract)
if a contract violate valid conditions for a valid contract then its said to be unenforceable.
for e.g ,you want to open out a bar contained by your state and your state prohibits it then its unenforceable though other states permit.