wú qíng
pitiless
ruthless
merciless
heartless
lěng kù wú qíng
cold-hearted
unfeeling
callous
wú qíng wú yì
completely lacking any feeling or sense of justice (idiom); cold and ruthless
cán kù wú qíng
cruel and unfeeling (idiom)
shuǐ huǒ wú qíng
fire and flood have no mercy (idiom)
fǎn liǎn wú qíng
to turn one's face against sb and show no mercy (idiom); to turn against a friend
zhuǎn miàn wú qíng
to turn one's face against sb and show no mercy (idiom); to turn against a friend
luò huā yǒu yì , liú shuǐ wú qíng
lit. the falling flowers are yearning for love, but the heartless brook ripples on (idiom)
fig. one side is willing, yet the other one remains indifferent (usually of unrequited love)