gran·di·ose (gr?n?d?-?s?, gr?n?d?-?s?)adj.1. Characterized by greatness of scope or intent; grand: a grandiose plan to develop the city’s waterfront.2. Characterized by excessive self-importance or affected grandeur; pompous: “It’s important … for judges not to be rattled by political attacks into grandiose assertions of judicial supremacy” (Jeffrey Rosen).[French, from Italian grandioso, from grande, great, from Latin grandis.]gran?di·ose?ly adv.gran?di·os?i·ty (-?s??-t?) n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.grandiose (??rænd????s) adj1. pretentiously grand or stately2. imposing in conception or execution[C19: from French, from Italian grandioso, from grande great; see grand] ?grandi?osely adv grandiosity, ?grandi?oseness nCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014gran?di?ose (?græn di?o?s) adj. 1. affectedly grand; pompous: grandiose words. 2. more complicated than necessary: a grandiose scheme. 3. grand in an imposing way. [1830?40;