blowhard

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[美國(guó)英語(yǔ)] [非正式]

He doesn't like to be a blowhard about what he's developed. 他不喜歡吹噓他研制的東西。