Of an offence, action, etc.: deserving of or entailing punishment.

Of or relating to punishment. Of an action, offence, etc.: punishable, esp. by law.

Subject or liable to discipline or chastisement; requiring or deserving of censure or punishment; punishable.

Punishable. rare.

Relating to or involving the imposition of penalties; subject to penalties, punishable.

Deserving to be punished. Obsolete.

Of an offence, etc.: that merits censure or chastisement under the rules of an institution; requiring or deserving of punishment; = disciplinable…

That is subject to a penalty or a punishment (in various senses of the verb).