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

The normally quiet state race became the focus on intense scrutiny because of a pattern of incendiary remarks by French, the former Tarrant County GOP chair.

— Ciara McCarthy, Fort Worth Star-Telegram, 4 Nov. 2026
Lara faced intense scrutiny and criticism during his eight years in office from Californians frustrated by rising prices, fewer options and how their claims were handled.

— Stephen Hobbs, Sacbee.com, 4 Nov. 2026

Definition of intense

Adjective

Jarman, who came in as the defending champion on the event, put together a more difficult routine but was nicked by judges for his execution.

— ABC News, ABC News, 24 Oct. 2026
This is the last remaining game on the schedule that should be very difficult.

— David Troy OutKick, FOXNews.com, 24 Oct. 2026

Definition of difficult

Adjective

Highly dependent on capital intensive deployments and leveraged financing, these firms must bring data centers online quickly to service debt with compute revenue and sustain operations.

— , CNBC, 6 Nov. 2026
Google said the Wyoming facility will use air cooling to reduce pressure on local water resources, rather than relying on water-intensive cooling systems.

— Neetika Walter, Interesting Engineering, 6 Nov. 2026

Definition of intensive

Adjective

Such calculations are part of a wider effort to understand why molecular simulations remain challenging.

— Rupendra Brahambhatt, Interesting Engineering, 24 Oct. 2026
But the shift in college athletics has required an internal reconciling that is even more challenging than the external education.

— Dana O’Neil, CNN Money, 24 Oct. 2026

Definition of challenging

Adjective

But this latest poll reflects a fierce anti-Trump sentiment among Michigan voters.

— Arkansas Online, Arkansas Online, 2 Nov. 2026
As the company navigates fierce critics and a wave of communities outside the Atlanta area ending their contracts, Flock has been tightening some standards on its own, nationwide.

— Graham Hurley, CNN Money, 1 Nov. 2026

Definition of fierce

Adjective

With the balance of power in Tallahassee at stake, Miami’s Republican state senators fended off tough challenges Tuesday night, while Democratic candidates flipped several South Florida state House seats for the minority party in Florida’s capital.

— Miami Herald staff, Miami Herald, 4 Nov. 2026
Whoever wins the contest will be stepping into one of the California’s toughest political jobs.

— Stephen Hobbs, Sacbee.com, 4 Nov. 2026

Definition of tough

Adjective

The rising, warming sea and ferocious winter storms have battered the road.

— Los Angeles Times, Los Angeles Times, 29 Oct. 2026
One of the most celebrated objects from the India Museum is a mechanical wooden sculpture of a ferocious tiger gnawing at a British soldier’s throat.

— Rebecca Mead, New Yorker, 26 Oct. 2026

Definition of ferocious

Adjective

Under 1% leave during the rigorous six-month SEAL Qualification Training course, which is the final leg of the pipeline before they are assigned to a SEAL team.

— James LaPorta, CBS News, 5 Nov. 2026
The agreement capped Iran’s uranium enrichment levels, reduced its operational centrifuge numbers, required Iran to repurpose its nuclear weapons development facilities, and established more rigorous international inspections to verify compliance.

— S. C. M. Paine, Foreign Affairs, 3 Nov. 2026

Definition of rigorous

Browse Nearby Words

hell

hellacious

hell-bent

See all Nearby Words

Cite this Entry

Style

“Hellacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hellacious. Accessed 6 Nov. 2026.

Copy Citation

Synonyms of hellacious

adjective

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

quondam

Popular in Grammar & Usage

How to Use 'Who' vs. 'Whom'

Merriam-Webster’s Great Big List of Words You Love to Hate

'Affect' vs. 'Effect'

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Why is '-ed' sometimes pronounced at the end of a word?

Popular in Wordplay

Great Big List of Beautiful and Useless Words, Vol. 5

9 Words That Sound Like Insults But Aren't

7 Words for Old-Timey Vehicles

The Words of the Week - Nov. 6

12 Lovely and Unusual Words for the Natural World

Popular

How to Use 'Who' vs. 'Whom'

Great Big List of Beautiful and Useless Words, Vol. 5

9 Words That Sound Like Insults But Aren't

Games & Quizzes