a verbal statement without any proof
In Chinese, Pinyin is k ō NGK ǒ UW ú P í ng, which means to speak only by mouth without any evidence, as long as it is proved in kind. It's from officialdom.
The origin of Idioms
The 27th chapter of Li Baojia's Officialdom appearance in Qing Dynasty: "students dare not speak to their teachers even if they have nothing to say."
Analysis of Idioms
[synonym] empty talk without evidence, without evidence without evidence
Idiom usage
As an object or attributive, it refers to the empty spoken language without evidence. I can't believe what you said.
a verbal statement without any proof
giant earthquakes and landslides - tiān bēng dì tān
fish for the moon in the water - shuǐ zhōng lāo yuè
an inch of silk and half a grain of rice -- a little bit - cùn sī bàn sù
The white head returned in vain - bái shǒu kōng guī
power capable of saving a desperate situation - huí tiān zhī lì