Malum Prohibitum
A Dictionary of Law · Henry Campbell Black · 1891
A Dictionary of Law
A wrong prohibited; a thing which is wrong because prohibited; an act which is not inherently immoral, but becomes so because its commission is expressly forbidden by positive law; an act involving an illegality resulting from positive law. Contrasted with malum in se.
Story, Ag. § 346.
Malum quo communius eo pejus
The more common an evil is, the worse it is. Branch, Princ.
Malus usus abolendus est
A bad or invalid custom is [ought] to be abolished.
Litt. § 212; Co. Litt. 141; 1 Bl. Comm. 76; Broom, Max. 921.