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say it: mur-KYUUR-ee-uhl
mercurial is an adjective meaning "liable to sudden unpredictable change". It carries 4 recorded senses.
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”
relating to or under the (astrological) influence of the planet Mercury
“the Mercurial canals”
relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god Mercury
“more than Mercurial thievishness”
relating to or containing or caused by mercury
“mercurial preparations”
“mercurial sore mouth”
Definitions, synonyms and semantic relations for mercurial come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.