a.

1. 喧鬧的，嘈雜的
   a noisy crowd

   喧鬧的人群

2. 充滿噪聲的，吵吵嚷嚷的
   The streets were as noisy as ever.

   街上和往常一樣喧鬧。

3. （顏色，服裝等）過分鮮豔的；（文體）過分渲染的
   He wore a noisy sweater.

   他穿了件顏色十分鮮豔的毛衣。

adj.

1. full of or making a lot of noise.
2. technical accompanied by random fluctuations that obscure information.