merciless

Definition

Showing no mercy; cruel and pitiless.

Etymology

From Middle English merciles, mercyles, equivalent to mercy + -less.

Example Sentences

• "The sun is merciless today, so please take care of yourself."
• "But the ruthless cleaning up of those streets and merciless treatment of gang members have triggered outrage and concern among human rights organizations, which have condemned Cecot as inhumane and unacceptable."