Synonyms of bubbleheaded

1 Syllable
flip, gay, mad, buoyant, yoyo
2 Syllables
fickle, dingdong, ditzy, sprightly, flighty, giddy, flightier, flaky, yo-yo, short-fuse, flightiest, gaga, ticklish
3 Syllables
movable, mercurial, erratic, unstable, inconstant, variable, capricious, lubricious, fluctuating, mobile, quicksilver, spirited, resilient, lighthearted, changeable, lively, up-and-down, elastic
4 Syllables
impulsive, volatile, effervescent, irregular, expansive
5 Syllables
unpredictable, irrepressible