be completely indifferent
⇒ 他对妈妈的一番苦心无动于衷。
He was completely indifferent to his mother's considerable efforts.
英语词典包含298861条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。