háo​bù​liú​qíng

relentless

毫不留情 háo​bù​liú​qíng
relentless expression
uncompromisingly harsh or severe, especially in criticism, judgment, or competition

He ruthlessly pointed out the project's flaws at the meeting.

ruthless expression
showing no mercy, pity, or leniency; to show no quarter in conflict or punishment

Crimes that endanger public safety must be dealt with mercilessly.

Frequency

Movie subtitles
1.46 per million appears in 1% of films
Written text
1.75 per million

Sources

Definitions
CC-CEDICT