criminal (adj.) Look up criminal at Dictionary.com
early 15c., from Middle French criminel (11c.), from Latin criminalis "pertaining to crime," from crimen (genitive criminis); see crime. Preserves the Latin -n-. Criminal law (or criminal justice) distinguished from civil in English at least since late 15c.
criminal (n.) Look up criminal at Dictionary.com
1620s, from criminal (adj.).