mercurial

Adjective
  1. Liable to sudden unpredictable change (synset 300346106)
    "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next"
    similar to: changeable, changeful - such that alteration is possible; having a marked tendency to change
    same as: erratic, fickle, quicksilver
  2. Relating to or under the (astrological) influence of the planet Mercury (synset 302877956)
    "the Mercurial canals"
  3. Relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god Mercury (synset 302877730)
    "more than Mercurial thievishness"
  4. Relating to or containing or caused by mercury (synset 302877560)
    "mercurial preparations"; "mercurial sore mouth"

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