• WordNet 3.6
    • adj featherbrained lacking seriousness; given to frivolity "a dizzy blonde","light-headed teenagers","silly giggles"
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Webster's Revised Unabridged Dictionary
    • a featherbrained Giddy; frivolous; lacking seriousness; given to frivolity; feather-headed.
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Century Dictionary and Cyclopedia
    • featherbrained Having a weak, empty brain; light-headed; frivolous; giddy. Also feather-headed, feather-pated.
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In literature:

Featherbrain, whom no reasoning and no pleading could touch, the glare of the firebrand had to illuminate: there remained but that method.
"The French Revolution" by Thomas Carlyle
I was always laughing and skipping about like a featherbrain.
"His Masterpiece" by Emile Zola
You I can trust; but she is a bit of a featherbrain, and one never knows what may happen.
"A True Friend" by Adeline Sergeant
Mr. Featherbrain's little motel, next door, didn't do very well for a couple of months after it opened.
"Four and Twenty Beds" by Nancy Vogel