Latin. An illegal agreement. This term is applied generally to all contracts which are contrary to law, contra bonos mores, or opposed to the principles of sound policy. No contract, which can be shown to belong to this category, can be legally enforced. Such, for example, are contracts entered into, or obligations granted ob turpem causam, obligations arising from betting or gambling transactions, the pactum de quotn litis, contracts imposing restraints on marriage, &c. Although such obligations cannot be enforced, yet where they have been fulfilled no action will lie for restitution, for the same illegality which bars the right to enforce, bars ...