大言不惭

tā men céng dà yán bù cán shuō yào lǐng dǎo wǔ shí gè guó jiā qián jìn

他们曾大言不惭，说要领导五十个国家前进。

They bragged unblushingly to lead fifty nations forward.

tán jí zì jǐ de néng lì tā huì zì chuī zì léi dà yán bù cán

谈及自己的能力，他会自吹自擂大言不惭。

He could become ungraciously immodest about his own capacities.