"大言不慚"用英語怎麼說？

“大言不慚”，漢語成語，意思是說大話而不覺得難爲情，可以翻譯爲“brag unblushingly，boast shamelessly，或be insolent enough to say something”。

例句：

他會大言不慚地吹噓自己的能力。

He could become ungraciously immodest about his own capacities.