turn a deaf ear 充耳不闻;置若罔闻;听而不闻;装聋作哑

【例句】
He turned a deaf ear to the rumours.
他对这些谣言置若罔闻。

Men are awake enough to their own interests, who turn a deaf ear to their friends' distress.
对朋友的痛苦置若罔闻的人，对个人的利益非常注意。