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See also Good faith (UCC). Missouri law is instructive. FED. R. CIV. P. 8(c) provides, among other things: In pleading to a preceding pleading, a party shall set forth affirmatively accord and satisfaction, arbitration and award, assumption of risk, contributory negligence, discharge in bankruptcy, duress, estoppel, failure of consideration, fraud, illegality, injury by fellow servant, laches, license, payment, release, res judicata, statute of frauds, statute of limitations, waiver, and any other matter constituting an avoidance or affirmative defense. 

V.A.M.S. § 509.090, the Missouri statute on the subject, is identical to FED. R. CIV. P. 8(c). The definition of 'good faith' in ...