ruthless

adj

1. Without pity or compassion; cruel, pitiless.

   “At length their rage the hoſtile Pow’rs reſtrain, / All but the ruthleſs Monarch of the Main.”

2. Uncompromising; unrelenting.

   “Particular note, in this period, should be made of the actions of Joseph Denman, commander of the Northern Division of the Squadron, who went on an absolutely ruthless and systematic campaign along the African coast, burning so-called "slaving factories" to the ground and openly daring anyone who objected to try and stop him.”

   “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.”