loud       
 adjective, adverb uk/laʊd/ us/laʊd/
A2 吵闹的,大声的,响亮的
making a lot of noise
  a loud explosion/noise/voice 巨大的爆炸声/巨大的吵闹声/洪亮的嗓音 
 I heard a loud bang and then saw black smoke. 我听到砰的一声巨响,接着就看到了黑烟。 
 Could you speak a little louder, please? 请你说话大声一点,好吗? 
 - More examples
 - We've had complaints that you've been playing your radio too loud.
 - I heard a loud crash in the kitchen.
 - The music just gets distorted when you play it so loud.
 - There was a sudden loud noise.
 - She let out a loud guffaw.
 
Idioms      
loud and clearidiom  清晰易懂的,清楚明白的
very clear and easy to understand
  I can hear you loud and clear. 我能非常清楚地听到你讲话。 
 The message from management came through loud and clear: things would have to change. 管理层发出的信息非常明确:必须进行变革。 
 out loudidiom B1 大声地,响亮地
If you say or read something out loud, you say or read it so that other people can hear you.
  I had to read the essay out loud in front of the whole school. 我不得不在整个学校面前大声朗读这篇文章。 
 loud       
adjective  disapproving uk/laʊd/ us/laʊd/
 (衣服)过于鲜艳的,花哨的;(人)惹人注目的,招摇的
(of clothes) having unpleasantly bright colours or too strong patterns, or (of a person) demanding attention and talking and laughing loudly
  You shouldn't wear anything too loud to a job interview. 你去参加求职面试时不要穿得太花哨。 
 The men at the bar were loud and obnoxious. 酒吧里的那些男人咋咋呼呼的让人作呕。