比较：

disturb 并非用心去扰乱，语气比perturb弱得多

Eg: It is disturbing to think that a dangerous wild animal is still at large in the quiet countryside. (NCE3 lesson 1)

plague 因病痛和类似的折磨而使人苦恼新概念英语青少版1a

Eg: The terrible disease plagued him

trouble 搅扰别人的舒适、安宁等

Eg: Sorry to give you trouble. / Sorry to trouble you.

worry 表达不安的心情到了忧虑的程度

Eg: He is worried about his son's safety.

fret 持续的忧虑、哀伤或焦急，表示烦燥的心情

Eg: He fretted himself all the time for news of her.

upset 内心忐忑不安

Eg: I feel upset now because I am afraid I hurt you.

dismay 使沮丧

Eg: We were all dismayed at his refusal to cooperate.