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.
Also, hellaceous.

hell + -acious (extracted from audacious, sagacious, vivacious, etc.), perhaps with intensive or augmentative force; cf. bodacious, splendacious

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World English Dictionary
hellacious (hɛˈleɪʃəs)
1.  remarkable; horrifying
2.  wonderful; excellent
[C20: from hell + -acious as in audacious]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
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.
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