stiffen

verb

ˈsti-fən How to pronounce stiffen (audio)
Definition of stiffennext
as in to strengthen
to make more harsh, uncompromising, or severe plans to further stiffen the already onerous requirements for admission to the elite military unit

Synonyms & Similar Words

Relevance

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 stiffen Over time, smoking can narrow and stiffen blood vessels and accelerate cardiovascular disease. — Katia Hetter, CNN Money, 16 Sep. 2026 But after a quick touchdown drive to take a 34-27 lead, the Oregon defense stiffened, and closed out the win with back-to-back stops. — Ian Miller Outkick, FOXNews.com, 6 Sep. 2026 Bile rose in Evie’s throat and her body stiffened under his touch. — Literary Hub, 2 Sep. 2026 Offering a 35% incentive aimed at stiffening up jobs here and enticing post-production to relocate to the Golden State, AB 2319 is racing toward a vote in the state Senate by next week once the bill is in final shape. — Dominic Patten, Deadline, 20 Aug. 2026 See All Example Sentences for stiffen
Recent Examples of Synonyms for stiffen
strengthen
Verb
  • In this role, Baudry will lead Bobbi Brown’s global strategy, strengthening the brand’s distinctive equity, advancing innovation and creativity and deepening consumer engagement.
    — Kathryn Hopkins, Footwear News, 8 Oct. 2026
  • The larger spread also strengthens hospitals’ incentive to choose costlier drugs and move treatment into 340B billing sites.
    — Casey B. Mulligan, STAT, 8 Oct. 2026
Definition of strengthen

Browse Nearby Words

stiffed
stiffen
stiffened
See all Nearby Words

Cite this Entry

“Stiffen.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/stiffen. Accessed 9 Oct. 2026.

Copy Citation
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Last Updated: - Updated example sentences

Popular in Grammar & Usage

See More

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'?
See More

Popular in Wordplay

See More

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

Even More Bird Names that Sound Like Insults (and Sometimes Are)
See More

Popular

See More

Do You Need a New Language Peeve?

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
a cup of tea and a golf ball on tee side by side
Quiz: Sounds Like... Choose the word that sounds like it fits the clue...
See All