Wiktionary
unfussed
a. not concerned or interested, blase
Usage examples of "unfussed".
Dharin, who seemed unfussed by what to Maerad looked like terrifying and threatening behavior.
The warm motor caught instantly, and in a smooth unfussed way they were at the crossing of the Boulevard de la Victoire with a green light and turning left into the Rue Vauban.
He was smiling and unfussed even though I now saw there was a streak of blood across his forehead.