sincere and honest
It is a Chinese idiom. Pinyin is k ǔ Nb ì w ú Hu á, which means sincerity but not vanity. It's true that you mean what you mean. It comes from Zhang Di Ji, the book of the later Han Dynasty.
The origin of Idioms
In the Southern Dynasty, Song Dynasty, Fan Ye's "the book of the later Han Dynasty, the chapter of emperor Ji", it is said that "the officials who are quiet have no brilliance."
Idiom usage
It refers to people's attitude.
Examples
be in perfect sympathy with each other. The introduction of daytime curtain by Hu Dachu of Song Dynasty
sincere and honest
present each other with gifts as a token of love - cǎi lán zèng yào
pay too much respect to one 's superiors and despise those who are of lower ranks - chǎn shàng ào xià