The Collaborative International Dictionary
featherbrained
featherbrained \feath"er*brained\, feather-brained \feath"er-brained\, a. Giddy; frivolous; lacking seriousness; given to frivolity; feather-headed. [Colloq.]
Syn: airheaded, dizzy, empty-headed, giddy, lightheaded, light-headed, silly.
Wiktionary
featherbrained
a. (alternative spelling of feather-brained English)
WordNet
featherbrained
adj. lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles" [syn: airheaded, dizzy, empty-headed, giddy, light-headed, lightheaded, silly]
Usage examples of "featherbrained".
I used to think it was because you were a featherbrained flyboy-oh, courageous and daring and all the rest of it, but essentially feather-brained, too.