adjective.large and impressive, in size, scope or extent
adjective.pompous or pretentious
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
affectedly genteel
adjective.
impressive because of unnecessary largeness or grandeur; used to show disapproval
Word Usage
"But Wednesday's speech - which Gingrich himself called "grandiose" - could actually resonate politically in Florida, where space exploration is good politics 14 miles away from Cape Canaveral."