gasbag

[gas-bag]
noun
1.
a bag for holding gas, as in a balloon or dirigible.
2.
Slang. a talkative, boastful person; windbag.

Origin:
1820–30; gas + bag

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World English Dictionary
gasbag (ˈɡæsˌbæɡ)
 
n
1.  a person who talks in a voluble way, esp about unimportant matters
 
vb , -bags, -bagging, -bagged
2.  (Irish) (intr) to talk in a voluble way, esp about unimportant matters

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Example sentences
By regurgitating gasbag talking points, deniers will never alter the perception of climate mavens.
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