ruthless
Definitions
Having or showing no pity or compassion for others.
Cruel, cold-blooded, or determined in the pursuit of a goal.
Examples
The ruthless dictator crushed any opposition to his rule.
She was known for her ruthless efficiency in the corporate world.
The predator was ruthless in its pursuit of the fleeing prey.
Synonyms
merciless pitiless cruel heartless brutal remorseless savage