HELLACIOUS Synonyms: 154 Similar and Opposite Words

hellacious

adjective

ˌhe-ˈlā-shəs

Definition of hellacious

as in intense

extreme in degree, power, or effect the hellacious heat was more than we could bear

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in difficult

requiring considerable physical or mental effort the pioneers survived a particularly hellacious river crossing with their covered wagon barely in one piece

Synonyms & Similar Words

Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of hellacious His hellacious brand of defense is a nightmare for opposing benches in particular. — Bryan Toporek, Forbes.com, 18 May 2026 The skiers were in a valley below Perry Peak, but the two survivors have described battling through hellacious conditions in the hour before the avalanche. — Andrew Graham april 2, Sacbee.com, 2 Apr. 2026 But the tour was a hellacious time for Bachman. — Andy Greene, Rolling Stone, 28 Feb. 2026 Even against a hellacious Houston defense, the Patriots’ shortest path to victory is to ask Maye to carry them yet again. — Andrew Callahan, Boston Herald, 15 Jan. 2026 See All Example Sentences for hellacious

Recent Examples of Synonyms for hellacious

Adjective

Through it all, Pi-o and Jeong-yo’s intense, often tender relationship serves as a throughline, bringing many viewers to question if the Netflix series qualifies as a boys’ love (aka BL) drama.

— Kayti Burt, Time, 6 Oct. 2026
The Castle of Oia is also lovely—though the sunset-seeking crowds can be intense.

— Condé Nast, Condé Nast Traveler, 6 Oct. 2026

Definition of intense

Adjective

Performances across the board are strong, even if the characterizations themselves are more difficult to embrace.

— Guy Lodge, Variety, 11 Oct. 2026
Making short-haul rail more competitive Parallel argues that its system could open routes that are currently difficult for conventional rail services to serve economically, particularly journeys under 500 miles.

— Kaif Shaikh, Interesting Engineering, 11 Oct. 2026

Definition of difficult

Adjective

The Reaveys spent Callum’s early years performing their own intensive physical and speech therapies with him, determined their son would roll over, crawl, and learn to say his name.

— Deepa Fernandes, STAT, 8 Oct. 2026
These are intensive oral sessions with examiners that are designed to test quick problem-solving and reveal knowledge depth.

— Reynald Fasciaux, Fortune, 8 Oct. 2026

Definition of intensive

Adjective

Disappointingly, her screenplay proceeds to unfold in a procession of frustrating get-outs and compromises, repeatedly choosing the least interesting or challenging direction to take this would-be throuple.

— Guy Lodge, Variety, 11 Oct. 2026
Oscar-winning DoP Greig Fraser knows a thing or two about working on challenging movies, from Dune to The Batman, Rogue One to Zero Dark Thirty.

— Andreas Wiseman, Deadline, 10 Oct. 2026

Definition of challenging

Adjective

In the aftermath of City being found guilty of a raft of financial breaches another fierce welcome was expected.

— ABC News, ABC News, 11 Oct. 2026
Her fierce survival instincts see her turn the tables on them, transforming their hunt into her own cat-and-mouse game.

— Abbey White, HollywoodReporter, 10 Oct. 2026

Definition of fierce

Adjective

Now, Germino says her social media presence is all about giving other patients going through the same tough decision an example of someone who’s thriving after the procedure.

— Kara McGrath, Allure, 6 Oct. 2026
Prime Minister Sébastien Lecornu's administration is about to start tough budget negotiations against a backdrop of division and economic turmoil.

— Chloe Taylor,Jenni Reid, CNBC, 6 Oct. 2026

Definition of tough

Adjective

In the Atlantic, not a single hurricane has formed yet, a record for this late into hurricane season, due to ferocious wind shear brought on by El Niño.

— Sean Macaday, Sacbee.com, 5 Oct. 2026
When the Heat acquired Giannis Antetokounmpo in June, the natural instinct was to focus on the prodigious point production (57th all time), the volume rebounding (71st all time), the thunderous dunks and the ferocious forays to the basket.

— Barry Jackson, Miami Herald, 4 Oct. 2026

Definition of ferocious

Adjective

The list takes months to compile, with multiple steps and checks designed to ensure the ranking is rigorous and consistent.

— Kelli Grant, CFP®,Riley de León, CNBC, 8 Oct. 2026
With rigorous reporting and more than 150 interviews with those working for the US’ most influential AI companies, technology journalist Roose covers Silicon Valley’s breakneck race to build artificial general intelligence.

— Mary Lawrence Ware, semafor.com, 6 Oct. 2026

Definition of rigorous

Browse Nearby Words

hell

hellacious

hell-bent

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Style

“Hellacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hellacious. Accessed 13 Oct. 2026.

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Synonyms of hellacious

adjective

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