IPA: /ˈpleɪn.tɪv/
KK: /ˈplentɪv/
Describing a feeling or sound that is sad and expresses sorrow or grief.
The plaintive song echoed through the empty hall, filling everyone with a sense of sadness.
Plaintive → It is formed from "plaint" (from Old French *plaint*, meaning a lament or complaint) and the suffix "-ive" (meaning having the nature of). The word "plaintive" describes a sound or expression that has the nature of a lament or sorrowful complaint.
Think of a 'lament' ('plaint') that has a 'nature' ('-ive') of sadness — that's why plaintive means expressing sorrow.