American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
Elsewhere on the web
With both fighters readying for war the fight fans should be ready for a hellacious throw down, and in this exclusive interview conducted by Doghouse Boxing, Guzman give his thoughts on the fight, enjoy.— Doghouse Boxing News
"The weather was hellacious," said Cathy Whitlock, a paleo-ecologist at Montana State University.— billingsgazette.com
The current 10 month old decline is hellacious, because it comes from the high of the range, with more room for lower prices and yet would remain in the presumed base;— US Market Commentary from Seeking Alpha
All right, Tyra, Twiggy, and Miss J, let's see you ladies negotiate such hellacious terrain.— Entertainment Weekly's PopWatch
Portland's got some hellacious depth.— SI.com

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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