given to flights of fancy; capricious; frivolous.

slightly delirious; light-headed; mildly crazy.

irresponsible

He said I was too flighty to be a good supervisor.

Archaic . swift or fleet.

adjective

responsible

adjective

airheaded , birdbrained , bubbleheaded , capricious , changeable , dingbat , dingdong , dizzy * , effervescent , empty-headed , featherbrained * , frivolous , gaga , giddy , harebrained * , impetuous , impulsive , inconstant , lightheaded , lively , mercurial , scatterbrained , silly , thoughtless , twit , unbalanced , unstable , unsteady , volatile , whimsical , wild , featherbrained , frothy , harebrained , lighthearted , anile , barmy , ditzy , dizzy , fickle , fleeting , foolish , helter-skelter , hoity-toity , imaginative , irresponsible , pompous , quicksilver , quixotic , skittish , swift , transient , utopian