malicious
Buddha's mouth and snake's heart, a Chinese idiom, Pinyin is f ó K ǒ ush é x ī n, which means the mouth of the Buddha and the heart of the snake; although the metaphor sounds good, the heart is very vicious. From the five Lantern Festival.
The origin of Idioms
Volume 20 of five Lantern Festival yuan written by Shi Puji of Song Dynasty: "all Buddhas were born, robbed and killed, their ancestors came to the west, blowing wind and setting fire, good knowledge in ancient and modern times, Buddhists' tongue and snake's heart, and the monks of the world threw themselves into the cage."
Idiom usage
It is used as complement and attribute. The seventieth chapter of the complete biography of Shuoyue written by Qian Cai in Qing Dynasty: "although I look ugly, my heart is kind, not like your heart."
malicious
deduce simplicity into complexity - yǐ jiǎn yù fán
be the same in essentials while differing in minor points - dà tóng xiǎo yì
use inferior materials and turn out substandard goods - tōu gōng jiǎn liào
even a drop of water couldn 't leak out - shuǐ xiè bù tòu
in guangdong dogs bark at the snow - yuè quǎn fèi xuě
there cannot be two kings in a country - tiān wú èr rì