Lament

From Conservapedia - Reading time: 1 min

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To lament is to feel or express profound grief, usually about the loss of something or someone. Often done in a genuine but dramatic or exaggerated fashion. A lament can be a poem, song or dirge expessing grief or mourning for a deceased person, and by extension loud wailing or sobbing.

It may also refer to a high degree of regret over one's actions.