"mercurial" in the adjective sense
1. erratic, fickle, mercurial, quicksilver
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"
2. Mercurial
relating to or under the (astrological) influence of the planet Mercury
"the Mercurial canals"
3. Mercurial
relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god Mercury
"more than Mercurial thievishness"
4. mercurial
relating to or containing or caused by mercury
"mercurial preparations"
"mercurial sore mouth"
Source: WordNet® (An amazing lexical database of English)
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