merciless
adj. 残忍的;无慈悲心的
例句
Monsanto's critics have attacked the company for its "merciless legal battles against small farmers" and they are hoping this will be the case that puts it in its place.
孟山都的评论家抨击该公司“对小农户发起了无情的法律斗争”,他们希望这一案件能让它得到应有的惩罚。