remorseless

adjective
1
seeming to continue or become worse in a way that cannot be stopped
بی‌پایان, بی‌وقفه, بی‌رحم, بی‌توقف, بی‌امان
synonym relentless
2
cruel and having or showing no regret for something wrong or bad you have done
بی‌رحم, سنگدل
a remorseless killer
The sea was dark and remorseless.
synonym merciless