blowhard /ˈbləʊˌhɑːd/

• 1. 

  N-COUNT If you describe someone as a blowhard, you mean that they express their opinions very forcefully, and usually in a boastful way. 吹牛者 [美国英语] [非正式]

  例：

  He doesn't like to be a blowhard about what he's developed.

  他不喜欢吹嘘他研制的东西。