6
excitable(adjective, upset, passionate, nervous, sensitive)
6
fitful(adjective, cross, careless, melancholy, uncertain)
6
fleet(adjective, sharp, lively, fast, quick)
6
moody(adjective, careless, unstable, unreasonable, restless)
6
rapid(adjective, sharp, lively, fast, quick)
6
ticklish(adjective, change, continue, difficult, delicate)
6
varying(adjective, unstable, irregular, unsettled, unpredictable)
6
whimsical(adjective, change, continue, careless, unstable)
5
effervescent(adjective, careless, lively, unstable, unreasonable)
5
expansive(adjective, lively, impulsive, unpredictable, changeable)
5
hasty(adjective, fast, quick, restless, fiery)
5
indecisive(adjective, unstable, unsettled, changeable, variable)
5
protean(adjective, unstable, unsettled, unpredictable, unreliable)
5
slutty(adjective, attitude, behavior, sexual moral, sexual activity)
5
spirited(adjective, sharp, lively, fast, changeable)
5
sprightly(adjective, sharp, lively, fast, changeable)
5
uneven(adjective, irregular, unpredictable, unreliable, unbalanced)
5
unfixed(adjective, unstable, unsettled, variable)
5
winged(sharp, lively, fast, velocity, speedy)
4
alive
11 years ago|16k views|share |citing 
APASmart Define. (2015). mercurial thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/mercurial/thesaurus/synonyms
ChicagoSmart Define. 2015. "mercurial thesaurus" https://smartdefine.org/mercurial/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, mercurial thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/mercurial/thesaurus/synonyms>.
MLASmart Define. "mercurial thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/mercurial/thesaurus/synonyms>