Mercurial
mediumNegative tonemur-KYOOR-ee-ul
adjective
Definition
Subject to sudden changes in mood or behavior; volatile and unpredictable
Memory hook
Like MERCURY in a thermometer — rapidly rising and falling with unpredictable mood changes.
Word roots
Learning roots unlocks whole word families. Study common GRE root words.
Examples
“Her mercurial temperament made it difficult for colleagues to predict her reactions to criticism.”
“The mercurial nature of the stock market kept investors on edge throughout the trading day.”
Test yourself
Fill in the blank with the right word:
“Her ______ temperament made it difficult for colleagues to predict her reactions to criticism.”
Show answer
mercurial
Synonyms
Antonyms
Categories
GRE Tip
Mercurial is a medium-difficulty GRE word. On the GRE, you might see it paired with synonyms like "volatile" or "capricious" in Sentence Equivalence questions. Look for contrast clues (however, despite, although) that signal the opposite meaning. Words like "steadfast".
Related GRE Words
capricious
Given to sudden and unaccountable changes of mood or behavior
fickle
Changing frequently, especially regarding one's loyalties or affections
arbitrary
Based on random choice or personal whim, rather than any reason or system
erratic
Not even or regular in pattern or movement; unpredictable
turbulent
Characterized by conflict, disorder, or confusion; not stable or calm
whimsical
Playfully quaint or fanciful, especially in an appealing way
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