na-adjective
Describes a place or scene full of people and activity, often with a positive sense of energy and prosperity.
週末の商店街はとても賑やかだ。
The shopping street is very bustling on weekends.
賑やかな
I enjoyed shopping at the lively market.
na-adjective
Describes voices, parties, or atmospheres that are animated and full of cheerful noise; can be neutral or slightly negative if the noise is excessive.
隣の部屋から賑やかな笑い声が聞こえる。
I can hear lively laughter from the next room.
子供たちが賑やかに遊んでいる。
The children are playing noisily and cheerfully.