1
as in intense
extreme in degree, power, or effect
the hellacious heat was more than we could bear
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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
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Recent Examples of hellacious
Even in the hellacious conditions of Greater Los Angeles, the suspension absorbs severe potholes, broken surfaces and expansion joints with little more than the sound of a muffled timpani strike.
—
Mark Ewing, Forbes.com, 2 Aug. 2025
The other nailed two runners on the bases with some of the most hellacious throws anyone had ever seen.
—Tyler Kepner, New York Times, 11 July 2025
Just when the series appeared to begin tilting toward Indiana deep into Game 4, with a 3-1 Pacers lead a real possibility, Lu Dort's hellacious defense helped force Indiana into tough shots and Shai Gilgeous-Alexander's scoring rescued Oklahoma City.
—Andrew Greif, NBC news, 18 June 2025
Lineups featuring the trio of Dunn-Jones-Leonard are going to be hellacious.
—Shane Young, Forbes, 13 Dec. 2024
See All Example Sentences for hellacious
Mark Ewing, Forbes.com, 2 Aug. 2025
The other nailed two runners on the bases with some of the most hellacious throws anyone had ever seen.
—Tyler Kepner, New York Times, 11 July 2025
Just when the series appeared to begin tilting toward Indiana deep into Game 4, with a 3-1 Pacers lead a real possibility, Lu Dort's hellacious defense helped force Indiana into tough shots and Shai Gilgeous-Alexander's scoring rescued Oklahoma City.
—Andrew Greif, NBC news, 18 June 2025
Lineups featuring the trio of Dunn-Jones-Leonard are going to be hellacious.
—Shane Young, Forbes, 13 Dec. 2024
See All Example Sentences for hellacious
Recent Examples of Synonyms for hellacious
Adjective
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This period of intense study laid the groundwork for what would later become known as the Korean New Wave.—
Literary Hub,
Literary Hub,
29 Jan. 2026
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Shares fell during his time in government but rebounded sharply in December, reaching a record high amid intense market interest in AI.—
Sujita Sinha,
Interesting Engineering,
29 Jan. 2026
Adjective
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This requires the difficult task of collecting precise, real-world measurements of complex nuclei and comparing the measurements with the models’ predictions.—
Prabhat Ranjan Mishra,
Interesting Engineering,
2 Feb. 2026
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While that process may prove difficult, the suspension option was hardly better.—
Zach LaChance,
The Washington Examiner,
2 Feb. 2026
Adjective
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The tech could have an outsized effect on knowledge workers by automating the repetitive, data-intensive cognitive tasks that typically define those white-collar roles.—
Tom Huddleston Jr.,
CNBC,
30 Jan. 2026
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Renee Nicole Good, a mother of three, was shot earlier this month while sitting in her car, while Alex Pretti, an intensive-care nurse, was killed in a separate encounter just over two weeks later.—
Becca Longmire,
PEOPLE,
30 Jan. 2026
Adjective
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If some species can continue reproducing even under challenging conditions, that resilience could buy ecosystems valuable time.—
Melissa Cristina Márquez,
Forbes.com,
29 Jan. 2026
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Much of Shrinking revolves around people going through challenging times and healing through finding love, such as Paul (Harrison Ford) beginning a relationship with his doctor.—
Skyler Trepel,
PEOPLE,
28 Jan. 2026
Adjective
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Those funds are caught in a fierce battle over Democratic proposals, now backed by some Republicans, to impose limits on the behavior of the ICE agents whose aggressive tactics in Minneapolis have left protesters Renee Good and Alex Pretti dead.—
Susan Page,
USA Today,
1 Feb. 2026
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Game director Cary Trzcinski made sure emotions did not boil over and lead to a melee, sticking his thick body and fierce game face into one brewing moment in the second half.—
Joe Davidson,
Sacbee.com,
1 Feb. 2026
Adjective
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Going through a severe injury is probably the toughest thing an athlete can go through.—
DJ Siddiqi,
Forbes.com,
29 Jan. 2026
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More companies are dialing back flexible work schedules and mandating that employees return to the office part-time or full-time, forcing women into tough situations.—
Jessica Guynn,
USA Today,
29 Jan. 2026
Adjective
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What Lee did not anticipate was the iron resolve, the ferocious tenacity, of the Union defenders.—
Jamelle Bouie,
Mercury News,
29 Jan. 2026
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But nobody is just strong and ferocious, and nobody is just a saint.—
Marta Balaga,
Variety,
28 Jan. 2026
Adjective
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Dozens of asylum seekers like her, as well as refugees who passed a rigorous, years-long vetting process before being admitted to the United States, have been arrested in Minnesota in recent weeks, immigration lawyers and advocates say.—
Ray Sanchez,
CNN Money,
30 Jan. 2026
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Every small business article is based on rigorous reporting by our team of expert writers and editors with extensive knowledge of business products.—
Jasmin Suknanan,
CNBC,
30 Jan. 2026
Cite this Entry
“Hellacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hellacious. Accessed 5 Feb. 2026.
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