Adjective
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relating to or containing or caused by mercury
"mercurial preparations"
"mercurial sore mouth"
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relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god Mercury
"more than Mercurial thievishness"
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relating to or under the (astrological) influence of the planet Mercury
"the Mercurial canals"
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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"