Adjective
horrible, awful, hellish, agonizing
nasty, repellent.
(slang) Remarkable, unbelievable, unusual.
Source: en.wiktionary.orgGod hates America, and God demonstrated that hatred to some modest degree only last Tuesday -- sent in those bombers, those hellacious 767 Boeing bombers, and it was a glorious sight. Fred Phelps
To me, there is no more conscientious umpire in the Major Leagues than Jim Joyce. He gives you a hellacious effort every time. Tony La Russa
Abby has both skills and strength, which is a hellacious match for any opponent. Source: Internet
If we have learned anything during this hellacious unending pandemic, it is that taking a walk can help. Source: Internet
People are actively fleeing the Bay Area to escape the hellacious air conditions, BART (being BART) suddenly shut down this morning, and gyms, nail and hair salons, and hotels are readying to reopen for certain indoor services starting tomorrow. Source: Internet
If you’ve got some hellacious restoration project or you’re a pro who needs state-of-the art tools, this software will do what you need. Source: Internet