quicksilver

Noun
  1. A heavy silvery toxic univalent and bivalent metallic element;
    The only metal that is liquid at ordinary temperatures (synset 114669524)
    is a type of: metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
    substance meronym:
    • cinnabar - a heavy reddish mineral consisting of mercuric sulfide; the chief source of mercury
    • calomel, mercurous chloride - a tasteless colorless powder used medicinally as a cathartic
    same as: atomic number 80, hg, hydrargyrum, mercury
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, mercurial

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