merciless• He was very sweet; sweet and merciless.• They gave Donlan the same mercilessbeating Clark received in Chicago.• And again events have dealt them a series of mercilessblows.• He had a cruel, clever, merciless face, with a big curvednose and very bright, hard eyes.• I have suffered as a result of this merciless hard line plenty of times myself.• The furies had claws and mercilessteeth.