Cavalier

The term "cavalier" generally describes an attitude or behavior that is dismissive, carelessly indifferent, or unconcerned, often in situations where one should show more seriousness or respect. In historical contexts, it refers to supporters of King Charles I during the English Civil War, who were characterized by their loyalty and aristocratic demeanor. Today, calling someone "cavalier" suggests they are taking an overly casual approach to important matters, potentially undermining their significance or the feelings of others involved.