Synonyms of mercurial

1 Syllable

gay, mad, buoyant, quick, spright, flying, flip, fleet

2 Syllables

winging, fickle, volant, sprightly, moody, flighty, fleetest, ticklish, wiggly, avian, flightier, volar, gaga, fleeter, dingdong, quicker, moodier, flaky, quickest, asap, yo-yo, short-fuse, rapid, flightiest, fickler

3 Syllables

erratic, airborne, tottery, volitant, tottering, mobile, agile, spirited, lighthearted, bipolar, elastic, movable, rapider, inconstant, capricious, up-and-down, vagarious, unstable, fluctuating, barreling, splenetic, volcanic, variable, lubricious, quicksilver, changeful, mutable, resilient, lively, changeable

4 Syllables

excitable, volatile, effervescent, irregular, humorsome, reversible, easy-moving, nimble-footed, impulsive, permutable, revocable, bubbleheaded, unequable, harefooted, expansive, inconsistent

5 Syllables

unpredictable, temperamental, irrepressible, commutative