?忧心忡忡

... sick at failing the examination为考试未能及格而不快 sick at heart忧心忡忡 sick for渴望,想望 ...

?伤感

... 听起来 sound; ring 伤感 sick at heart; sentimental 听起来有趣 that sounds fun ...

?因受外界事物感触而引起悲伤

... [wounded P.O.W.s] 受伤的被俘人员 [sick at heart] 因受外界事物感触而引起悲伤 [the bird that has been injured by the bow] 受过箭伤的鸟,比喻遭受过祸患,遇事胆怯的人 ...