心(こころ)にも無(な)い(something) one does not really mean, insincere

心(こころ)にも無(な)いお世辞(せじ)は要(い)りません。

I don't need insincere flattery that one does not really mean. {(something) one does not really mean, insincere}

心(こころ)にも無(な)い事(こと)で責(せ)められてキョトンとする。

I am taken aback when blamed for something insincere or that I don't really mean. {(something) one does not really mean, insincere}

夫(おっと)：「さっきはごめん…。心(こころ)にも無(な)く言(い)い過(す)ぎたよ…。」

Husband: "I apologize for earlier... I said more than I really meant..." {(something) one does not really mean, insincere}

心(こころ)にも無(な)い謝罪(しゃざい)を聞(き)くくらいなら、聞(き)かない方(ほう)が何(なん)倍(ばい)もマシだ。

Rather than hearing an insincere apology, it's many times better not to hear at all. {(something) one does not really mean, insincere}

彼女(かのじょ)はよく心(こころ)にもないことを口(くち)にするので彼女(かのじょ)のことは信用(しんよう)できません。

She often says things she does not really mean, so I can't trust her. {(something) one does not really mean, insincere}