(每日一词）plaintive

Plaintive /ˈpleɪntɪv/ adj.  (声音或嗓音) 哀伤的 

Meaning: A plaintive sound or voice sounds sad.

词根: plaint- 抱怨 (complain, complaint) 

后缀: -ive 形容词后缀

e.g. The singer's plaintive voice touched the hearts of everyone in the audience. 歌手悲伤的声音触动了观众每个人的心。