Turpis causa
Defined in 2 dictionaries — Black's (1910), Bouvier (1839)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A base cause; a vile or immoral consideration ; a consideration which, on account of its immorality, is not allowed by law to be sufficient either to support a contract or found an action ; e. g., future illicit intercourse.
Defined under Turpis in Black's Law Dictionary.
A Law Dictionary, Adapted to the Constitution and Laws of the United States
John Bouvier · 1839
contracts. A base or vile consideration, forbidden by law, which makes the contract void; as a contract the consideration of which is. the future illegal cohabitation of the obligee with the obligor.