lament

Concise Oxford English Dictionary © 2008 Oxford University Press:
lament/ləˈment/

▶noun

• 1 a passionate expression of grief.

• 2 a song, piece of music, or poem expressing grief or regret.

▶verb

• 1 mourn (a person's death).

  ■ (as adj. lamented) (usu. late lamented) a conventional way of referring to a dead person.

• 2 express regret or disappointment about.

– derivatives
lamentation noun,
lamenter noun.

– origin ME (as v.): from Fr. lamenter or L. lamentari, from lamenta (pl.) ‘weeping’.