merciless
adjective
- pitiless/unrelenting (without/showing no mercy)
Wiktionary
Pronunciation: /ˈmɜːsɪləs/ / /ˈmɝsɪləs/
adj
Etymology: From Middle English merciles, mercyles, equivalent to mercy + -less.
- Showing no mercy; cruel and pitiless.
“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.”