Plaint (noun)

1. A complaint or expression of grief, sorrow, or dissatisfaction.
2. An archaic term for a song or piece of music that expresses sorrow or mourning.

Origin:

Middle english, from old french plainte, from latin planctus 'lamentation, mourning song', from plangere 'to lament'.

Examples:

1. The customer lodged a plaint with the company about the poor service they had received.
2. The widow made a mournful plaint at her husband's graveside.
3. The workers voiced their plaints about working conditions and demanded better treatment.
4. The singer performed a haunting plaint that brought tears to the audience's eyes.
5. The poet wrote a beautiful plaint about the loss of a loved one and the pain of goodbye.