uberrimae fidei

adjective | \ yü-ˈber-i-ˌmē-ˈfī-dē-ˌī, ü-ˈber-ē-ˌmī-ˈfē-dā-ˌē \ | uber·ri·mae fi·dei
  1. : of the utmost or perfect good faith contracts of insurance are traditionally contracts uberrimae fidei