“nonchalantly”
“My shrug was so nonchalant it would make a cat jealous”
“What I was hungry for was sitting nonchalantly next to me on the couch.”
“Juan nonchalantly drove the shovel through the head of the zombified maid, and the drama was over.”
“He moved in a way that suggested he was attempting the world speed record for the nonchalant walk.”
“The author refers to a player's affected nonchalance and comments he is, "too young to realize you are what you pretend to be.”