plaintiveness

/ˈpleɪntɪvnəs/
noun
  1. The quality of sounding sad or mournful; a sorrowful tone or expression.
    • His letter had a plaintiveness that revealed how lonely he was.
    • The plaintiveness of her voice made everyone in the room feel her grief.
    • There was a gentle plaintiveness in the melody of the lullaby.
Antonyms
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