bombast
He declared bombastically that it was time for him to teach his insolent enemies a lesson about respect.
Their latest stage show is bombastically ambitious.
He bombastically said that the country needed "a new Nelson Mandela" with the strong suggestion that he saw himself in the role.
Some of his films have been bombastically bad but none have been boring.

SMART Vocabulary: related words and phrases

Showing arrogance and conceit
(as) proud as Luciferidiom
airs and gracesidiom
arrogant
arrogantly
as if you owned the placeidiom
egoistically
egomaniacal
egomaniacally
egotistic
egotistically
patronizingly
pomposity
pompous
pompously
popinjay
swollen head
swollen-headed
talk down to someone
think the (whole) world revolves around youidiom
throw your weight aroundidiom