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mercurial

mer·cur·i·al

mercurial

 
pronunciation:
mr kyuh ri l
part of speech: adjective
definition 1: volatile in temper; changeable; fickle.
The mercurial leader was quick to fire his generals.
synonyms:
changeable, fickle, temperamental
antonyms:
even, saturnine, stable
similar words:
capricious, erratic, flighty, inconstant, lubricious, mobile, moody, moonish, protean, skittish, unpredictable, unstable, volatile
definition 2: of or relating to the element mercury.