make promises easily but seldom keep them
As a Chinese idiom, Pinyin is Q ī ngnu ò Gu ǎ x ì n, which means to easily agree to other people's requirements and must rarely keep promise. From Laozi.
The origin of Idioms
Chapter 63 of Laozi: "if a man is light on promise, he will have little faith, and if he is easy, he will be difficult."
Idiom usage
Contraction; predicate, object, attribute; derogatory. My family is not trusty. (strange tales from a lonely studio by Pu Songling in Qing Dynasty)
make promises easily but seldom keep them
appreciation goes without saying - tāo zài zhī jǐ