ruthless

Having no compassion or pity; merciless.

Having no ruth or pity; cruel; pitiless; barbarous; insensible to the miseries of others.

Unmodified or unrestrained by pity; marked by unfaltering rigor; relentless; merciless: as, ruthless severity.

Synonyms Unpitying, hard-hearted.

Having no ruth; cruel; pitiless.

Without pity or compassion; cruel, pitiless.

without mercy or pity