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 This was a hellacious heavyweight matchup that lived up to the hype. — Scott Wheeler, New York Times, 10 Apr. 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
  • During periods of intense rainfall, the risk of flooding increases, particularly in low-lying and flood-prone areas.
    — NC Weather Bot, Charlotte Observer, 8 July 2026
  • Treating fear and anxiety in dogs doesn’t always require a bigger yard or a more intense exercise routine.
    — Ryan Brennan, Fort Worth Star-Telegram, 7 July 2026
Definition of intense
Adjective
  • Sarah Buck, Chicago Driving has become harder The rapid increase in bike lanes has made driving much more difficult and tedious, with numerous delays due to many streets being reduced to one lane in busy areas.
    — Chicago Tribune, Chicago Tribune, 5 July 2026
  • Republican strategists have welcomed those nominations as an opening for attack in a difficult election year.
    — Susan Page, USA Today, 5 July 2026
Definition of difficult
Adjective
  • But that is labor intensive, and when a fire burns thousands of acres, the time and cost involved can be too high.
    — Los Angeles Times, Los Angeles Times, 9 July 2026
  • Built for expansion Aurora was used to perform the computationally intensive quantum chemistry simulations integrated into ChemGraph, while the ALCF Inference Service provided access to open-weight language models hosted on Argonne systems.
    — Neetika Walter, Interesting Engineering, 9 July 2026
Definition of intensive
Adjective
  • This enduring legacy, underscores the lawyer's role as an officer of the court, preserving the rule of law even when challenging authority.
    — Joseph Andrew, Forbes.com, 4 July 2026
  • Educate your family on our country’s history, both good and challenging.
    — Harriette Cole, Mercury News, 4 July 2026
Definition of challenging
Adjective
  • Its young people are increasingly educated and ambitious but many are frustrated over fierce competition for limited jobs.
    — Ayushi Shah, CNN Money, 4 July 2026
  • The Pride and Angel City have established a fierce rivalry in their short history.
    — Orlando Sentinel Staff, The Orlando Sentinel, 4 July 2026
Definition of fierce
Adjective
  • The talks are meant to focus on the toughest matters, including fully reopening the strait and rolling back Tehran’s disputed nuclear program.
    — Jon Gambrell, Los Angeles Times, 9 July 2026
  • Patrick Cantlay made a little noise in an otherwise quiet year for the American with five birdies in 10 holes and then a collection of tough par saves at the end that felt just as valuable.
    — ABC News, ABC News, 9 July 2026
Definition of tough
Adjective
  • Known for his command of ferocious demon-quelling deities, Zhenwu remains a popular deity in Daoist exorcist rituals in places such as Taiwan.
    — Michael Naparstek, The Conversation, 6 July 2026
  • That’s because a parasite called Cyclospora, which can contaminate raw produce and causes ferocious and long-lasting bouts of diarrheal illness, is making people sick across several states.
    — Brenda Goodman, CNN Money, 3 July 2026
Definition of ferocious
Adjective
  • Every cybersecurity article is based on rigorous reporting by our team of expert writers and editors.
    — Brian Sloan, CNBC, 3 July 2026
  • This improves both customer and agent experience, while still meeting rigorous business standards around accuracy, reliability, and risk management.
    — Forbes.com, Forbes.com, 2 July 2026
Definition of rigorous

Browse Nearby Words

hell
hellacious
hell-bent
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Cite this Entry

“Hellacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hellacious. Accessed 11 Jul. 2026.

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