regrettable

a. 可叹的,可惜的,抱歉的

It is regrettable that few people shall walk today because of the development of traffic facilities.

由于交通设施的发展，现在很少人愿意步行，这是很可惜的。

It's regrettable that you diddled away the whole afternoon.

真可惜，你把整个下午浪费掉了。