(每日一词）wistful

Wistful  /ˈwɪst.fəl/ adj. 伤感的；（对已不可能发生之事）徒然神往的

meaning: thinking sadly about sth that you would like to have, especially sth in the past that you can no longer have 

联想: wist—wish 希望

后缀: -ful 形容词后缀

e.g. I thought about those days in Spain and grew wistful. 我想起了那些在西班牙的日子，思念之情油然而生。