unhappy because you are thinking about problems or unpleasant things that might happen

She was sitting behind her desk with a worried expression/look on her face. 她坐在桌子后面，神色焦急。

They don't seem particularly worried about the situation. 他们看起来对这种局面并不十分担心。

You had me worried (= you made me feel anxious) back there - I thought for a second that you wouldn't be able to stop in time. 你刚才让我担心了一阵——我以为你不能及时停下来。

He was worried sick (= extremely worried) when he heard that there had been an accident. 他听到有事故发生之后担心得要命。