- Quid turpi ex causa promissum est non valet
- A promise which is founded upon an immoral consideration is not binding.
Ballentine's law dictionary. Anderson, W.S.. 1998.
Quid turpi ex causa promissum est non valet
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quid turpi ex causa promissum est non valet — /kwid tarpay eks koza pramisam est non vaslat/ A promise arising out of immoral circumstances is invalid … Black's law dictionary