I frown upon that behavior.

我厌恶这种行为。

I frown upon that behavior.

我讨厌这类行为。

And they might frown upon our behavior.

他们可能会看不惯我们的行为。

I frown upon smoking in public restaurants.

我不赞成在公共餐厅中抽烟。

I am sure your father would frown upon such a proposal.

我肯定你父亲不会赞成这样一个建议。