* Formal: "The university boasts an illustrious history, having produced many Nobel laureates and renowned scholars."
* Historical: "The illustrious Queen Elizabeth I ruled England during a period of great cultural and economic prosperity."
* Descriptive: "The concert hall was filled with an illustrious crowd of music lovers, dressed in their finest attire."
* Informal: "After a long and illustrious career, the actor retired to a quiet life in the country."
You can also use "illustrious" to describe something that is very impressive or famous:
* "The city's illustrious skyline is a sight to behold."
* "The restaurant is known for its illustrious menu of gourmet dishes."
Remember that "illustrious" is often used to describe people or things that are admired for their achievements or accomplishments.