How could you use the word ennui as a noun in sentence?

Here are a few examples of how to use "ennui" as a noun in a sentence:

* "The endless summer days, filled with nothing but boredom, gave rise to a deep ennui that settled over him." (This example emphasizes the feeling of boredom and listlessness associated with ennui.)

* "A sense of ennui crept into the meeting as the speaker droned on, repeating the same points over and over again." (Here, ennui describes a feeling of boredom and disinterest in the meeting.)

* "The luxurious palace, with its endless banquets and lavish decorations, ultimately became a prison of ennui for the bored princess." (This example uses ennui to show the feeling of emptiness and dissatisfaction that can come from a life of excess.)

Let me know if you'd like more examples!