1. in a way that shows no mercy or compassion; without pity or kindness

Examples

• The dictator ruled mercilessly over his people.
• She was mercilessly teased by her classmates.
• The sun beat down mercilessly on the desert travelers.
• The critic mercilessly attacked the new play.
• He trained mercilessly for the Olympic trials.
• The storm mercilessly battered the coastal town.
• The teacher graded the exams mercilessly.