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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for hellaciousperfect, fantastic, good, tough, exceptional, tremendous, positive, awesome, admirable, terrific, marvelous, bad, wonderful, fine, best, absolute, heavy, expert, adept, crack
adjective US slang
Word Origin for hellacious
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
Online Etymology Dictionary, © 2010 Douglas Harper