na-adjective, noun
bustling; prosperous; thriving
Describes a lively, crowded, and commercially active area. Often used in the phrase 繁華街 (bustling district).
この辺りはとても繁華な地域です。
This area is a very bustling district.
夜になると繁華街は人でいっぱいになる。
At night, the entertainment district becomes crowded with people.