One who makes empty, noisy conversation; a chatterer.(noun)
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Use "rattlehead" in a sentence
"And while I object to paying taxes to support some rattlehead for the rest of his natural life, I'd rather have it that way than to have someone start a trend of bopping off everybody who has not the ability to absorb the educational level of the scholar."
"Spiritualist or other -- I think it was Ophelia Beebe or some rattlehead like her -- got him to go to see a medium who was boardin 'here at the"