August (adjective)
Definition: having a formal and impressive quality
Why I Looked It Up
A sidebar in a book about skyscrapers discussed the business value of super-tall buildings.
…the mile-high tower – as august as it sounds – makes no economic or commercial sense
Update
2023-11-21
In the NY Times Connections game, “August” was under the category “Venerable,” alongside: grand, noble, and regal.