Merciless

1.

~ (to towards somebody something) (showing no mercy, pitiless, cruel) ដែលមិនអត់ឱន
Example: a merciless tyrant; the sun's merciless heat.merciless man ដែលគ្មានមេត្ដា, ដែលឥតប្រណី, merciless storm ដ៏កំណាច
Example: A merciless Killer.

1.

Destitute of mercy; cruel; unsparing; -- said of animate beings, and also, figuratively, of things; as, a merciless tyrant; merciless waves.

1.

barbarous, bestial, brutal, brute, brutish, carnal, coarse, cruel, ferocious, gross, inhuman, pitiless, remorseless, rough, rude, ruthless, savage, sensual

1.

civilized, courteous, gentle, humane, kind