mercurial
[adjective]
Synonyms: lively, active, capricious, changeable, impulsive, irrepressible, mobile, quicksilver, spirited, sprightly, unpredictable, volatile

---

Antonyms: saturnine
Related Words: buoyant, effervescent, elastic, expansive, resilient, mobile, movable, adroit, clever, cunning, ingenious

[TahlilGaran] English Synonym Dictionary ▲

mer‧cu‧ri‧al /mɜːˈkjʊəriəl $ mɜːrˈkjʊr-/ adjective

1. literary having feelings that change suddenly and without warning:
an actor noted for his mercurial temperament

2. literary quick and clever:
her mercurial wit

3. technical containing mercury

[TahlilGaran] Dictionary of Contemporary English ▲