Densely

The densely populated areas are prone to traffic congestion.

The train compartment was densely packed with commuters during peak hours.

The densely packed train during rush hour was overwhelming.

The subway train was densely packed with commuters during rush hour.

The densely populated apartment building has a strict noise policy.

The city streets were densely packed with cars during rush hour.

The apartment building had densely arranged rooms on each floor.

The densely populated apartment building had limited parking space.