hellacious

adjective

ˌhe-ˈlā-shəs How to pronounce hellacious (audio)
Definition of hellaciousnext
1
as in intense
extreme in degree, power, or effect the hellacious heat was more than we could bear

Synonyms & Similar Words

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Antonyms & Near Antonyms
2
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
  1. intense
  2. difficult
  3. intensive
  4. challenging
  5. fierce
  6. tough
  7. ferocious
  8. rigorous
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
  • Finding people at high risk of incubating the Bundibugyo virus, also known as contact tracing, has proved difficult in Congo.
    — CONSTANT SAME BAGALWA, Arkansas Online, 4 Oct. 2026
  • McKinsey’s data says some of those moves can be difficult for certain workers.
    — Catherina Gioino, Fortune, 3 Oct. 2026
Definition of difficult
Adjective
  • At research-intensive institutions, critical knowledge is often distributed across specialized offices, sponsor websites, internal guidance, prior submissions and experienced staff.
    — Mayank Kejriwal, Forbes.com, 1 Oct. 2026
  • Removing the thermal drying stage could also make electrode manufacturing less capital- and energy-intensive.
    — Neetika Walter, Interesting Engineering, 1 Oct. 2026
Definition of intensive
Adjective
  • Until now, scientists could measure the total phosphorus preserved in ancient rocks, but determining the share that was actually available to marine life remained challenging.
    — Sharmila Kuthunur, Space.com, 3 Oct. 2026
  • Alas, its path appears quite challenging, given that Digger earned a C+ CinemaScore from audiences and holds a 51 percent approval from reviewers on Rotten Tomatoes.
    — Ryan Gajewski, HollywoodReporter, 3 Oct. 2026
Definition of challenging
Adjective
  • The rare show of alignment among fierce rivals was soon countered by comments from Meta’s Zuckerberg and Nvidia’s Jensen Huang, both of whom dismissed the slowdown idea.
    — Alyson Shontell, Fortune, 5 Oct. 2026
  • The book and series focus on the complicated romance of Canadian hockey prodigy Shane Hollander (Hudson Williams) and Russian phenom Ilya Rozanov (Connor Storrie), who are the fierce on-ice rivals and the league’s best players.
    — Nicole Fell, HollywoodReporter, 4 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
See all Nearby Words

Cite this Entry

“Hellacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hellacious. Accessed 9 Oct. 2026.

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