mal·um in se /'ma-ləm-in-'sē, 'mä-lu̇m-in-'sā/ n pl mala in se /'ma-lə-, 'mä-/ [New Latin, offense in itself]: an offense that is evil or wrong from its own nature irrespective of statute
— often used with a preceding noun (as crime or act )
held that burglary was a crime malum in se — State v. Stiffler, 788 P.2d 2205 (1990) compare malum prohibitum
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.