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What do you call someone who talks themselves up but actually does nothing?

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The word for this would probably be "Blowhard."

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An idiom commonly used for a smooth talker is great boaster, little doer.

If you are looking for some uncommon expression, you may refer to a loquacious lazybones.

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An adjective that can be used to define a person who only talks but does not work is "garrulous".

The meaning as given by Google is: excessively talkative, especially on trivial matters. The usage of the word would be "a garrulous cab driver".

  • (1) It seems that this answers only half of the question.  For example, a cab driver could be garrulous and still do his job (and more). (2) Google is not an information source / reference.  If you quote a definition, identify the dictionary it actually came from. – Scott Sep 9 '18 at 4:52
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Pretentious also works as a single word.

" pre·ten·tious prəˈten(t)SHəs/ adjective attempting to impress by affecting greater importance, talent, culture, etc., than is actually possessed. "

Reference:
"Hearts of Ladd" by Ian Alford

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