The concept of unobtainium is often applied hand-waving, flippantly or humorously. When Walter arrives, he enters cheerfully, laughing with his family, and flippantly greets her. It's not one I've made lightly or flippantly. She flippantly discusses what exciting things she would wish to happen to her. Instead, they are direct and often flippantly casual. Max flippantly says he'll be fine as the ring is his lucky charm. One of the committee members flippantly suggests nominating Linda Lovelace.