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“penal” in Latin

The English word penal itself goes back to Latin poena, through penalis.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

penal
Relating to punishment, by circumlocution. A penal law, *lex poenam sanciens.
Having a punishment attached, poena or (stronger) supplicio dignus (of persons or things): animadvertendus (of things; e.g., facinus).

Quick answer

What is the Latin word for penal?
The usual Latin words for “penal” are poena, animadvertō, facinus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.