adjective
Synonyms: giddy 1, dizzy, empty-headed, featherbrained, frivolous, harebrained, rattlebrained, scatterbrained, silly, skittish
Related Word: changeable, inconstant, mercurial, unstable; buoyant, effervescent, volatile; gay, lively, sprightly; irresponsible
Contrasted words: constant, dependable, reliable, responsible, trustworthy; stable; sedate
Antonyms: steady