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 Even simple movements can encourage healthy blood flow and keep fascia from stiffening up. — Jennifer Heimlich, Time, 27 July 2026 This remains soft during low-energy movement but stiffens upon high-impact force. — Arthur Zaczkiewicz, Footwear News, 27 July 2026 Older dogs stiffen up, scratch more, lose a step, and their owners want to help. — Daniel Fusch, USA Today, 17 July 2026 Graham's aorta, at 71, tore, a dissection along a wall stiffened by decades of what the medical examiner called arteriosclerotic cardiovascular disease. — Dr. Céline Gounder, CBS News, 13 July 2026 See All Example Sentences for stiffen
Recent Examples of Synonyms for stiffen
strengthen
Verb
  • Designed for limp, oily, and dull hair, the color-safe formula washes away stubborn dirt and grime—common culprits of flat waves—while a lineup of amino acids work to soften and strengthen strands.
    — Madison San Miguel, Allure, 5 Sep. 2026
  • If superconductivity in magic-angle graphene were primarily driven by phonons, or vibrations of the atomic lattice, weakening Coulomb interactions would be expected to leave the effect largely unchanged or even strengthen it slightly.
    — Neetika Walter, Interesting Engineering, 5 Sep. 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 5 Sep. 2026.

Copy Citation
Last Updated: - Updated example sentences
Love words? Need even more definitions?

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

Popular in Grammar & Usage

See More

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

A List of Most Commonly Confused Words

Why do we use apostrophes to show possession?

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

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

Popular in Wordplay

See More

The Longest Long Words List

Stay Woke

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

The Words of the Week - Sept. 4
See More

Popular

See More

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

The Longest Long Words List

Stay Woke
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
anagrams on a chalk board
Word Builder Quiz Vol. 2 Pick the letter that when added to a word will ma...
See All