ruthless
adj
1 having or showing no pity or compassion; cruel 无怜悯心或同情心的; 残忍的
show ruthless disregard for other people´s feelings 对别人的感情漠不关心
a ruthless dictator 残酷的独裁者
be utterly ruthless in one´s determination to succeed 下决心争取成功对一切毫不留情.
2 never slackening or stopping; unremitting 决不松懈的; 永不停止的; 持久的
set off at a ruthless pace 勇往直前
ruthless schedules, demands 决不放松的时间安排、 要求.