FORMIDABLE Synonyms: 162 Similar and Opposite Words

formidable

adjective

ˈfȯr-mə-də-bəl

Definition of formidable

as in terrifying

causing fear a formidable, irascible old man who frightened the neighborhood children

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in difficult

requiring considerable physical or mental effort running a marathon is a formidable undertaking

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 formidable As two formidable women go head-to-head, their battle for the soul of Longview exposes the secrets, resentments, and desires lurking beneath its picture-perfect surface. — Matt Grobar, Deadline, 9 Oct. 2026 Their gains are in stark contrast to AT & T , Verizon Communications , and T-Mobile , all down sharply on prospects of SpaceX becoming a formidable rival in mobile broadband; of the three, T-Mobile was down the most with a roughly 10% decline. — Tobias Burns, CNBC, 9 Oct. 2026 Lawrence and Jonathan Allen form a formidable interior defensive lineman duo that has the Bengals ranked eighth against the run through four weeks. — David Furones, Sun Sentinel, 8 Oct. 2026 Isaias will likely make landfall sometime early Saturday morning as a weakening, but formidable hurricane. — Rachael Jay, CBS News, 8 Oct. 2026 See All Example Sentences for formidable

Recent Examples of Synonyms for formidable

Adjective

As an actress, a character like that was thrilling and terrifying.

— William Earl, Variety, 7 Oct. 2026
Alas, Hersh was to miss the flight because he was still being held hostage, starving, tortured, and surviving on that date in terrifying confinement.

— Rachel Goldberg-Polin, Time, 6 Oct. 2026

Definition of terrifying

Adjective

Performances across the board are strong, even if the characterizations themselves are more difficult to embrace.

— Guy Lodge, Variety, 11 Oct. 2026
Making short-haul rail more competitive Parallel argues that its system could open routes that are currently difficult for conventional rail services to serve economically, particularly journeys under 500 miles.

— Kaif Shaikh, Interesting Engineering, 11 Oct. 2026

Definition of difficult

Adjective

Josh, much of the social media conversation around people seeing The Odyssey in theaters was about the frightening Other Mommy trailer playing ahead of it.

— Lexy Perez, HollywoodReporter, 2 Oct. 2026
My Broken Brain follows three young survivors through the most frightening days of their lives and the grueling journey back to independence.

— Jesse Whittock, Deadline, 30 Sep. 2026

Definition of frightening

Adjective

Disappointingly, her screenplay proceeds to unfold in a procession of frustrating get-outs and compromises, repeatedly choosing the least interesting or challenging direction to take this would-be throuple.

— Guy Lodge, Variety, 11 Oct. 2026
Oscar-winning DoP Greig Fraser knows a thing or two about working on challenging movies, from Dune to The Batman, Rogue One to Zero Dark Thirty.

— Andreas Wiseman, Deadline, 10 Oct. 2026

Definition of challenging

Adjective

The Rangers announced the devastating news on Saturday following a scary injury in which the 30-year-old’s right skate jammed into the post while gliding across his crease in the first period.

— Scott Thompson OutKick, FOXNews.com, 10 Oct. 2026
Watching her film in the water was one of the scariest moments as a mom, because the tank was pitch black.

— Tanya Fedak, Variety, 10 Oct. 2026

Definition of scary

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

Platforms prefill a name, email and phone number so a user can submit in one tap without leaving the feed, which is wonderful for a consumer promotion and terrible for a six-figure investment.

— Jonathan Durante, Forbes.com, 5 Oct. 2026
Saddled with terrible reviews and negative word-of-mouth, Tom Cruise‘s absurdist dark comedy has cratered at the box office with $8 million in North America and $20 million globally in its first weekend of release.

— Rebecca Rubin, Variety, 5 Oct. 2026

Definition of terrible

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

formidability

formidable

forming

See all Nearby Words

Cite this Entry

Style

“Formidable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/formidable. Accessed 12 Oct. 2026.

Copy Citation

Synonyms of formidable

adjective

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

nexus

Popular in Grammar & Usage

Do You Need a New Language Peeve?

The Exceptions of '-s' and '-es' Plurals

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

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Popular in Wordplay

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

7 Words for Bad Endings and Rough Situations

The Words of the Week - Oct. 9

Why do we call it a 'flea market'?

Popular

Do You Need a New Language Peeve?

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

Games & Quizzes