他做了个虚请假意的承诺.用英语怎么说？

他做了个虚请假意的承诺.

He made an unctuous assurance.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

made

adj. …制的，（人工）做成的，拼成的，虚构的，保证成功的；v. 使(make的过去式和过去分词)；

例句
Single people are treated as an aberration and made to pay a supplement.
独身者被当成异类，而且要付一笔额外的费用。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

unctuous

adj. 油的，油膏的，似油的，松软肥沃的；

例句
...the kind of unctuous tone that I've heard often at diplomatic parties.
我常在外交聚会上听到的那种虚与委蛇的腔调

assurance

n. 保证，担保，（人寿）保险，确信，厚脸皮，无耻；

例句
They had given an absolute assurance that it would be kept secret.
他们信誓旦旦地保证将对此绝对保密。