1
as in intense
extreme in degree, power, or effect
the hellacious heat was more than we could bear
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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
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Recent Examples of hellacious
Edmonton superstar Connor McDavid dished out three assists and a hellacious hit on Czechia forward Lukas Sedlec on his first shift early in the first period that set the tone for a fast paced, hard hitting and unselfish display of often breathtaking hockey.
—
Scott M. Reid, Oc Register, 13 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
Playing a school driver who has to get a bunch of kids to safety during a hellacious, out-of-control California fire, McConaughey learned how to drive a bus, grinding gears and everything.
—Brian Truitt, USA Today, 19 Sep. 2025
Having a baby is never an easy experience, but the sixth episode of Outlander: Blood of My Blood plunged poor Julia (Hermione Corfield) into a hellacious labor experience.
—Maureen Lee Lenker, Entertainment Weekly, 6 Sep. 2025
See All Example Sentences for hellacious
Scott M. Reid, Oc Register, 13 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
Playing a school driver who has to get a bunch of kids to safety during a hellacious, out-of-control California fire, McConaughey learned how to drive a bus, grinding gears and everything.
—Brian Truitt, USA Today, 19 Sep. 2025
Having a baby is never an easy experience, but the sixth episode of Outlander: Blood of My Blood plunged poor Julia (Hermione Corfield) into a hellacious labor experience.
—Maureen Lee Lenker, Entertainment Weekly, 6 Sep. 2025
See All Example Sentences for hellacious
Recent Examples of Synonyms for hellacious
Adjective
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What sets this masa harina apart is its distinct, intense corn flavor.—
Inés Anguiano,
Bon Appetit Magazine,
13 May 2026
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Being confined to a wooden chair, wearing that impressive multilayered costume, in the intense heat of Gran Canaria.—
Georg Szalai,
HollywoodReporter,
13 May 2026
Adjective
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When Thomson went through a difficult divorce, in 2014, Djena would often check in on her, showing up at her door with food.—
Yudhijit Bhattacharjee,
New Yorker,
18 May 2026
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Crow-Armstrong had just failed to make a highly difficult, leaping catch at the wall.—
Alejandro Avila OutKick,
FOXNews.com,
18 May 2026
Adjective
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Rice University’s Kinder Institute study found that newcomer students in the kindergarten through fifth grade age range who are eligible for intensive newcomer English programs experience a measurable academic boost, lasting up to three years after eligibility.—
Fort Worth Star-Telegram,
Fort Worth Star-Telegram,
15 May 2026
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And it is currently made, almost everywhere in the world, through a process that is energy-intensive, waste-heavy, and engineered for an environment with almost no environmental regulation.—
Afdhel Aziz,
Forbes.com,
15 May 2026
Adjective
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Figuring out how to animate them was challenging.—
Marta Balaga,
Variety,
13 May 2026
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With more than 7,300 yards of play, this challenging course also allows shorter three- or six-hole loops, perfect for golf vacations with kids who may not be up for an entire 18-hole round.—
Megan duBois,
USA Today,
13 May 2026
Adjective
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Elsewhere, Juventus was roundly jeered after losing 2-0 at home to fierce rivals Fiorentina, while Como held on for a 1-0 win over Parma to leave Cesc Fàbregas’ team still in with a chance of qualifying for the Champions League just seven years after playing in Italy's fourth division.—
ABC News,
ABC News,
17 May 2026
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In the remote native villages of Kipnuk and Kwigillingok, on the coast of the Bering Sea, Halong’s fierce flooding lifted homes off their foundations and carried them down a river with people still inside.—
Ella Nilsen,
CNN Money,
17 May 2026
Adjective
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Each of those teams will be competing for playoff spots again, leaving the Raiders with no easy divisional wins and a tough out-of-division schedule.—
Sam Warren,
New York Times,
15 May 2026
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The group did just enough against Sale and a tough Braves bullpen to avoid getting shut out for the third time in five games.—
Meghan Montemurro,
Chicago Tribune,
15 May 2026
Adjective
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The first wave of women’s-rights activists won suffrage for women, against ferocious and sometimes violent opposition.—
Helen Lewis,
The Atlantic,
14 May 2026
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Featuring aching, ferocious performances from Emmy winners Hannah Einbinder and Gillian Anderson, Camp Miasma imagines the resurrection of a dormant slasher franchise.—
David Canfield,
HollywoodReporter,
11 May 2026
Adjective
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Students reportedly balanced rigorous courses and activities Many of the students took difficult classes such as AP Physics, AP Economics and multivariable calculus while also participating in clubs, sports and community organizations.—
Anthony Thompson,
USA Today,
15 May 2026
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The report goes on to say separate academies for immigrant and refugee students can deny them access to rigorous coursework and diverse elective options, and can hinder their academic process and social integration.—
Fort Worth Star-Telegram,
Fort Worth Star-Telegram,
15 May 2026
Cite this Entry
“Hellacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hellacious. Accessed 20 May. 2026.
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