without the slightest discount
As a Chinese idiom, Pinyin is d ī Shu ǐ B ù ch à n, which means that the description is very pure. It's from impermanence.
The origin of Idioms
Lu Xun's "picking up flowers in the morning and evening: impermanence": "the axiom of dealing with others without mixing water is better for oneself than to be able to find some private feelings even in the secret department."
Idiom usage
It's very pure. example this is pure rice wine without mixing.
without the slightest discount
with one 's hair standing and the corners of the eyes splitting -- boil with anger - fà zhǐ zì liè