mer·ci·less /ˈmɜːsɪləs $ ˈmɜːr-/ adjectiveadj 1 CRUELcruel and showing no kindness or forgiveness 冷酷无情的,残忍的 2 merciless heat/cold/wind etc heat, cold etc that is very great or strong and unpleasant, and does not stop 酷热/严寒/凛冽的风等 It brings some relief from the merciless summer heat. 它给夏天的酷热带来些许凉意。
merciless heat/cold/wind etc• During the merciless heat of noon one of the frailer females collapsed, far from any possible shelter.
—mercilessly adverbadv He teased his sister mercilessly. 他无情地戏弄他的姐姐。