* His cavalier attitude towards deadlines often led to last-minute rushes and stress. (This sentence uses "cavalier" to describe a careless or dismissive attitude.)
* The knight's cavalier demeanor hid a heart filled with deep sorrow. (Here, "cavalier" describes a confident and self-assured outward appearance.)
* She dismissed his concerns with a cavalier wave of her hand. (This sentence uses "cavalier" to describe a dismissive gesture.)
Let me know if you'd like to see more examples or have a specific situation in mind!