One who is showy but lacking substance or real authority.
dog and pony show
Any presentation or display that is overly contrived or intricate, whi …
all hat and no cattle
Full of big talk but lacking action, power, or substance; pretentious.
talk through one's hat
To speak lacking expertise, authority, or knowledge; to invent or fabr …
hot air
Empty, confused, or exaggerated talk lacking meaning or substance; blu …
all bark and no bite
all hat and no cowboy