Populously is an adjective that describes a place that is densely populated or has a large number of people. Some synonyms for populously include bustling, crowded, densely populated, highly populated, heavily populated, populous, teeming, and thriving. These words are often used to describe a metropolis, a city center or an urban area where there is a constant flow of activity and people. Other synonyms that can be used to describe a crowded place include busy, lively, vibrant, animated, and full of life. These words help to paint a picture of a place that is bustling with energy and activity and filled with people and life.