Mean and thoughtless
It is a Chinese idiom. Pinyin is k è B ó Gu ǎ s ī, which means to treat people coldly and unkindly. From Mr. Zhu Ziqing by Feng Zhi.
The origin of Idioms
Feng Zhi's Mr. Zhu Ziqing: "the same party, the different, the mean and the thoughtless can't be read in Mr. Zhu's writing."
Idiom explanation
Less: less. He is cruel and unkind to others.
Mean and thoughtless