mercurial
[ mer-kyoor-ee-uhl ]
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Part of Speech adjective
Origin + Etymology
late Middle English from Latin mercurialis "relating to the god Mercury," from Mercurius "Mercury," mercurial dates from the mid 17th century
Synonyms
  • effervescent impulsive unpredictable fickle flaky
Antonyms
  • certain
  • constant
  • predictable
  • reliable
  • stable
Definition
changeable; volatile; fickle; flighty; erratic
Example
A) Her mercurial temperament made everyone act cautiously around her. B) His interest in things is best described as mercurial; he changes his mind every day.
Usage Over Time

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