The phrase "vanishing acts" refers to disappearing or disappearing without a trace. Synonyms for this phrase include eluding capture, evanescence, evaporation, disappearance, and fading away. Other synonyms include stealth and invisibility, which suggest a deliberate or intentional act of hiding or avoiding detection. Disappearing can also imply a sense of mystery or magic, while fading suggests a gradual diminishment or decline. Regardless of the specific synonym used, all of these terms describe a state of being that is difficult to grasp or understand, and that can be both fascinating and unsettling at the same time.