What is another word for "dullness"?

Roget's Thesaurus (1911) lists these synonyms for "dullness": abeyance, and, blanket, blunt, book, boring, caught, cold, commonplace, conte, damp, dead, deadly, dearth, depress, ditch, dormant, dry, dull, dust, ear, fact, fall, fire, flat, flatness, gas, hang, heaviness, heavy, humdrum, importance, inaction, inactive, inactively, inactivity, inert, inertia, inertion, inertness.