Informal:
* "The children were jolly and full of energy after their trip to the zoo."
* "We had a jolly good time at the party last night."
* "She's a jolly good friend who always knows how to make me laugh."
Formal:
* "The mayor gave a jolly speech at the town's annual festival."
* "The old man's eyes twinkled with jolly amusement."
* "The restaurant was decorated with jolly holiday cheer."
Other examples:
* "I'm feeling jolly today, let's go for a walk in the park."
* "The jolly old man sat by the fireplace, sipping his hot cocoa."
* "The Christmas decorations made the room feel jolly and festive."
Note: "Jolly" can also be used as an exclamation, meaning "Good heavens!" or "Goodness me!"
* "Jolly! I won the lottery!"
* "Jolly! Look at the size of that fish!"
The best way to use "jolly" depends on the tone and context of your writing.