* Formal: "The guests maintained a high level of decorum throughout the formal dinner, refraining from loud conversations or inappropriate behavior."
* Informal: "Despite the excitement of the party, everyone managed to observe a decent level of decorum."
* Humorous: "The comedian's jokes were hilarious, but they pushed the boundaries of decorum in a way that made the audience both laugh and cringe."
* Sarcastic: "The politician's speech lacked any sense of decorum, resorting to personal attacks and inflammatory rhetoric."
The meaning of "decorum" can be nuanced, so the sentence you use will depend on the specific context.