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[he-ley-shuh s] /hɛˈleɪ ʃəs/
adjective, Slang.
remarkable; astonishing:
They're raising a hellacious amount of money in taxes.
formidably difficult:
We had a hellacious time getting here in the blizzard.
Origin of hellacious
hell + -acious (extracted from audacious, sagacious, vivacious, etc.), perhaps with intensive or augmentative force; cf. bodacious, splendacious Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hellacious
  • Must have been hellacious, but not quite hellacious enough to shatter the planet.
  • He threw high fastballs nobody could touch, and a slider with a hellacious diagonal break.
  • He wasn't trying to throw a hellacious scare into his teacher.
British Dictionary definitions for hellacious


adjective (US, slang)
remarkable; horrifying
wonderful; excellent
Word Origin
C20: from hell + -acious as in audacious
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hellacious

1930s, college slang, from hell + fanciful ending (cf. bodacious).

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for hellacious



Excellent; wonderful; great: It was a hellacious picnic (1930s+ College students)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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