mercurial mer-KYOOR-ee-uhl adjective WS #28

subject to sudden or unpredictable changes of mood or mind; volatile and changeable; lively and quick-witted; relating to the planet Mercury or the element mercury

1. Her mercurial temperament made it difficult for colleagues to predict her reactions.
2. The mercurial weather patterns made it impossible to plan outdoor activities with confidence.
3. The actress was known for her mercurial performances that kept audiences captivated and surprised.
4. His mercurial personality could shift from cheerful to melancholy in a matter of minutes.
5. The mercurial stock market swung wildly between gains and losses throughout the day.