热闹是指人多声杂、热烈非凡的场面。在英语中，可以用lively、bustling、boisterous、animated、vibrant等词来表达热闹的意思。例如，The street market was bustling with people and music.（街头市场人声鼎沸，音乐响起）；The party was boisterous and lively with laughter and music.（派对上笑声和音乐此起彼伏，异常热闹）。