One who gabbles, or prates loquaciously on a trifling subject.(noun)
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Use "gabbler" in a sentence
"Amos Waughops was no match for the boy with his nimble legs, and, flushed and beaten, the gabbler hobbled back to his desk."
"_ Me -- a tee-talker, a green-gabbler, a prattler on the links, the lowest form of life known to science!"
"Christendom ever arranged a dinner party of any pretensions without including at least one intensely disagreeable person -- a vain and vapid girl, a hideous woman, a follower of baseball, a stock-broker, a veteran of some war or other, a gabbler of politics."