What is another word for "depression"?

Roget's Thesaurus (1911) lists these synonyms for "depression": abase, abasement, about, abysmal, adown, and, ankle, basement, bathometer, bathymetry, battlement, below, bend, beneath, benthal, beyond, bilge, bob, bottomless, bow, bring, cast, cellar, concave, concavity, couch, courtesy, cower, crater, crenate, crenated, crenelle, crenulate, crimp, crouch, crouched, curtsy, cut, dash, debase.