Grandiose is usually used disapprovingly to describe something that seems impressive or is intended to be impressive, but that is either not possible or practical.

// The long-vacant historic building has finally been purchased, and the developer has announced grandiose plans to make it the center of a new theater district.

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“Henry [VIII] was a leader known for his grandiose presentation, a love of dramatic rhetoric and self-promotion, and a fondness for blaming others. He carefully curated his image, issuing official portraits and closely managing public appearances. His reign concentrated power in one man and his obsessions.” — Philippa Gregory, LitHub.com, 29 Oct. 2025

When it comes to bigness, there’s grand and then there’s grandiose. Both words can be used to describe something impressive in size, scope, or effect, but while grand may lend its noun a bit of dignity (i.e., “we had a grand time”), grandiose often implies a whiff of pretension. The difference between a grand plan for the city park and a grandiose one, for example, might be the difference between a tasteful fountain and a garden full of topiaries cut in the shapes of 19th century literary figures. So if you’re choosing between the two, a helpful mnemonic might be that the extra letters in grandiose suggest that one’s ideas, claims, promises, schemes, dreams—you get the idea—are a bit extra.