mer·ci·less 
/ˈmɚsɪləs/ adjective
/ˈmɚsɪləs/ adjective [more merciless; most merciless] : having or showing no mercy : very cruel or harsh
▪ a merciless killer ▪ a merciless army ▪ the merciless killing of innocent people ▪ merciless honesty ▪ He has been merciless in his criticism of his opponent.
▪ a merciless killer ▪ a merciless army ▪ the merciless killing of innocent people ▪ merciless honesty ▪ He has been merciless in his criticism of his opponent.
— mer·ci·less·ly adverb
▪ mercilessly honest criticism ▪ the mercilessly hot sun
▪ mercilessly honest criticism ▪ the mercilessly hot sun
