The Collaborative International Dictionary of English v.0.48:
Dreariness \Drear"i*ness\, n. 1. Sorrow; wretchedness. [Obs.] [1913 Webster] 2. Dismalness; gloomy solitude. [1913 Webster]WordNet (r) 3.0 (2006):
dreariness n 1: extreme dullness; lacking spirit or interest [syn: boringness, dreariness, insipidness, insipidity]