Regrettably. In a manner deserving or inspiring lamentation.

plural of lamenter

One who laments.

(rare) Replete with lamentation; mournful.

Abbreviation of Lamentations.

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

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.

plural of lamentation

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