Uberrima Fides

Uberrima fides (sometimes seen in its genitive form, uberrimae fidei) is a Latin phrase meaning "utmost good faith" (or translated literally, "most abundant faith"). It is the name of a legal doctrine which governs insurance contracts. This means that all parties to an insurance contract must deal in good faith, making a full declaration of all material facts in the insurance proposal. This contrasts with the legal doctrine of caveat emptor (let the buyer beware).
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Perfect good faith; abundant good faith.

This phrase is used to express that a contract must be made in perfect good faith, concealing nothing; as in the case of insurance, the insured must observe the most perfect good faith towards the insurer.
   

This entry contains material from Bouvier's Legal Dictionary, a work published in the 1850's.