without mercy or pity; "an act of ruthless ferocity"; "a monster of remorseless cruelty"
Someone who is remorseless is prepared to be cruel to other people and feels no pity for them. the capacity for quick, remorseless violence. + remorselessly re·morse·less·ly They remorselessly beat up anyone they suspected of supporting the opposition
Being without remorse; having no pity; hence, destitute of sensibility; cruel; insensible to distress; merciless
If you describe something, especially something unpleasant, as remorseless, you mean that it goes on for a long time and cannot be stopped. the remorseless pressure of recession and financial constraint. = relentless + remorselessly re·morse·less·ly There have been record bankruptcies and remorselessly rising unemployment