no comment

无可奉告

It is impolite to make unfavourable comments on a person’s appearance.

对他人的外貌作负面评价是不礼貌的。

They are always commenting on / upon what I’m wearing.

他们总是对我的穿着评头论足。

The discovery is hardly commented by the press.

这个发现新闻界几乎未作评论。