adj
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emotionally unpredictable ; rapidly changing in mood
감정의 변화를 예측하기 어려운, 변덕스러운 ; 기분이 급작스럽게 바뀌는
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A person with a mercurial personality is one who changes rapidly and unpredictably between one mood and another.
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Mercurial Helen was crying one minute, laughing at next.