Synonyms of the word

penal

• adj. Of or relating to punishment.
• adj. Subject to punishment; punishable.
• adj. Serving as a place of punishment.

illegal

• adj. Contrary to or forbidden by law, especially criminal law.
• adj. Forbidden by established rules.
• adj. (philately, of an issue printed for collectors) Totally fictitious, and often issued on behalf of a non-existent…
• adj. (of a person, sometimes offensive) Being or doing something illegally.
• adj. (chiefly US, sometimes offensive) Being an illegal immigrant; residing in a country illegally.
• n. (colloquial, offensive) An illegal immigrant.
• n. An illegal resident spy.

punishable

• adj. Able to be punished; appropriate for punishment.

punitive

• adj. (law, military) inflicting punishment, punishing.

punitory

• adj. punitive; tending to punish.