Relating to or characteristic of the element mercury, which is a heavy, silvery-white metal that is liquid at room temperature and highly toxic.
Subject to sudden and unpredictable changes in mood or behavior; erratic and volatile in nature.
Characterized by qualities such as eloquence, shrewdness, swiftness, or thievishness, reminiscent of the Roman god Mercury.
Characterized by quick and unpredictable changes in mood, behavior, or temperament, reminiscent of the swift movements and influences associated with the planet Mercury in astrology.