Plaint
/pleɪnt/
Definition 1 of 2
Pro Tip 1/3Literary Usage
Used more often in literature or writing to evoke emotion. 
The novel ended with the protagonist's mournful plaint echoing in the silence.
Pro Tip 2/3Emotional Weight
Carries a sense of deep sadness or sorrow. 
Her voice trembled with plaint when she recounted the tale.
Pro Tip 3/3Not for Joy
Though 'joyful plaint' seems contradictory, it's rarely used for happiness. 
The phrase 'joyful plaint' is unusual and often poetic.