Explanation: Means acting secretive, unknown. Usage: Complex sentence; for clause; describe things done very secret Source: Yuan Anonymous "enemy creditors" second off: "It troubles mysteriously, days high to thick." Examples: Yao Xueyin "Rereading," Volume I Chapter 14: "Rereading and Liu Zongmin so ~ to leading a team of over a Luonan ambush in the eastern foot of the mountain forests in the Mountain."