The Collaborative International Dictionary of English v.0.48:
Boredom \Bore"dom\, n. 1. The state of being bored, or pestered; a state of ennui. --Dickens. [1913 Webster] 2. The realm of bores; bores, collectively. [1913 Webster]WordNet (r) 3.0 (2006):
boredom n 1: the feeling of being bored by something tedious [syn: boredom, ennui, tedium]