"I would think," she said, in a mystical whisper that did not conceal her obvious annoyance, "that some of us" — she stared very meaningfully at Harry— "might be a little less frivolous had they seen what I have seen during my crystal gazing last night.
"Aaaaah," said Ron, imitating Professor Trelawney’s mystical whisper, "when two Neptunes appear in the sky, it is a sure sign that a midget in glasses is being born, Harry…… " Seamus and Dean, who were working nearby, sniggered loudly, though not loudly enough to mask the excited squeals from Lavender Brown — "Oh Professor, look! I think I’ve got an unaspected planet!
There are no more uses of "mystic" in the book.
Show samples from other sources
She is a mystic who believes enlightenment will come from communing with nature.
She is a mystic who claims to be able to both talk to the dead and see into the future.