mercurial

adj 1: liable to sudden unpredictable change; "erratic behavior";

"fickle weather"; "mercurial twists of temperament";

"a quicksilver character, cool and willful at one

moment, utterly fragile the next" [syn: {erratic}, {fickle},

{quicksilver(a)}]

2: relating to or under the (astrological) influence of the

planet Mercury; "the Mercurial canals" [syn: {Mercurial}]

3: relating to or having characteristics (eloquence,

shrewdness, swiftness, thievishness) attributed to the god

Mercury; "more than Mercurial thievishness" [syn: {Mercurial}]

4: relating to or containing or caused by mercury; "mercurial

preparations"; "mercurial sore mouth"