MENTIRI EST CONTRA MENTEM IRE TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.Latin, meaning To lie is to act against the mind. Related Posts:E.CONTRACTUS EST QUASI ACTUS CONTRA ACTUMNEMO TENETUR ARMARE ADVERSARIUM CONTRA SEOMNIA PRAESUMUNTUR CONTRA SPOLIATOREMPECCATA CONTRA NATURAM SUNT GRAVISSIMANEMO CONTRA FACTUM SUUM VENIRE POTEST