1. in a grand, impressive, or ambitious manner; with great scale or magnificence
2. in an exaggerated or pretentious manner; with excessive or affected grandeur
Usage: often implies insincerity or overstatement

Examples

• The architect grandiosely announced plans for a massive new stadium.
• She spoke grandiosely about her achievements, exaggerating every detail.
• The company grandiosely promised to revolutionize the entire industry.
• He gestured grandiosely as he described his vision for the future.
• The director grandiosely declared this would be the greatest film ever made.
• They lived grandiosely, spending money on lavish parties and expensive art.