Regrettably. In a manner deserving or inspiring lamentation.

An expression of grief, suffering, sadness or regret. / A song expressing grief.

(intransitive) To express grief; to weep or wail; to mourn. / (transitive) To feel great sorrow or regret; to bewail.

Causing sorrow, distress or regret; deplorable, pitiful or distressing.

plural of lamentation

The act of lamenting. / A sorrowful cry; a lament. / Specifically, mourning.

(biblical) a book of the Old Testament of Bible, and of the Tanakh

present participle of lament

Lamentation.

plural of lament