Bemoan, v. t. [imp. & p. p. Bemoaned; p. pr. & vb. n. Bemoaning.]
Etymology: [OE. bimenen, AS. bem; pref. be- + m to moan. See Moan.]
To express deep grief for by moaning; to express sorrow for; to lament; to bewail; to pity or sympathize with. Implores their pity, and his pain bemoans. Dryden.
Syn. -- See Deplore.
Shades of meaning
Fernald has no entry of its own for bemoan; he lists it under mourn.
He lists it without comment; the entries above explain its neighbors.