1
as in speed
a high rate of movement or performance
the amazing fastness with which the boy took his shower had us wondering if he'd used any water
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Antonyms & Near Antonyms
2
as in stronghold
a structure or place from which one can resist attack
the guerillas retreated to their network of hidden fastnesses deep within the mountains
Synonyms & Similar Words
3
as in loyalty
adherence to something to which one is bound by a pledge or duty
his uncompromising fastness to the cause of freedom was beyond question
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of fastness
Like the pressing, the hard work mentality and fastness of transition for example.
—
Andy Jones, New York Times, 29 May 2025
Editors and contributors compare dozens of sets and look for qualities such as softness, durability, breathability, color fastness, and how well the linens launder and withstand wear.
—Yelena Moroz Alpert, Architectural Digest, 16 May 2025
The system ensures good wet-rubbing and dry-rubbing fastness and softness on all kinds of fabrics.
—Angela Velasquez, Sourcing Journal, 30 Dec. 2024
The Neutral Ground had cowboys (or Cow Boys), Indians, cavalry attacks and rescues, and secret woodland fastnesses known only to the canniest frontiersman.
—Ian Frazier, The New Yorker, 15 July 2024
The technology uses specific formaldehyde-free agents to enhance the dyeing process of raw garments, resulting in a bright and deep indigo color, improving wash and rubbing fastness, and increasing lightfastness and levelness.
—Andrea Onate, WWD, 12 June 2024
Andy Jones, New York Times, 29 May 2025
Editors and contributors compare dozens of sets and look for qualities such as softness, durability, breathability, color fastness, and how well the linens launder and withstand wear.
—Yelena Moroz Alpert, Architectural Digest, 16 May 2025
The system ensures good wet-rubbing and dry-rubbing fastness and softness on all kinds of fabrics.
—Angela Velasquez, Sourcing Journal, 30 Dec. 2024
The Neutral Ground had cowboys (or Cow Boys), Indians, cavalry attacks and rescues, and secret woodland fastnesses known only to the canniest frontiersman.
—Ian Frazier, The New Yorker, 15 July 2024
The technology uses specific formaldehyde-free agents to enhance the dyeing process of raw garments, resulting in a bright and deep indigo color, improving wash and rubbing fastness, and increasing lightfastness and levelness.
—Andrea Onate, WWD, 12 June 2024
Recent Examples of Synonyms for fastness
Noun
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Both Nomad bikes are perfectly capable analog bikes in their own right, a rare attribute in a market obsessed with offering ever more speed and range.—
William Roberson,
Forbes.com,
17 Sep. 2025
-
As that suggests, a key element of the new fund is speed [and capitalizing on an opportunity.—
Andre Mouchard,
Oc Register,
16 Sep. 2025
Noun
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The current administration is prioritizing domestic supply chains for these critical minerals as China is the dominant global supplier and is viewed to be weaponing this stronghold.—
Todd Gordon,
CNBC,
16 Sep. 2025
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The destination of where Tanjiro and Demon Slayer Corps have fallen is the demons' stronghold -- the Infinity Castle.—
Paul Tassi,
Forbes.com,
13 Sep. 2025
Noun
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The emotional record, shared alongside a video and lyrics posted to Instagram, hears Thugger addressing infidelity, loyalty, fractured friendships, while taking full accountability for his mistakes.—
Amber Corrine,
VIBE.com,
12 Sep. 2025
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All Vera Wang Bride purchases will qualify for David’s Diamond Loyalty Program, the industry’s first and only bridal loyalty rewards program.—
Lisa Lockwood,
Footwear News,
12 Sep. 2025
Noun
-
Thursday’s rehab appearance with Triple-A Iowa went well enough (2 1/3 innings/38 pitches), and the club has also seen an uptick in velocity.—
Patrick Mooney,
New York Times,
13 Sep. 2025
-
In a post on X on Tuesday, Berardelli said the wind shear—meaning a rapid change in wind velocity or direction—was a reason why the Atlantic should remain quiet for the next 10 days.—
Anna Skinner,
MSNBC Newsweek,
12 Sep. 2025
Noun
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What can any of us make of our momentary intimate lives in such an immense world, with equally immense unknowns, mysteries as great as death or the whale, as deep as love or the ocean, as sad and beautiful as a jellyfish torn and glistening in a small fortress of shore rock?—
Natalie Diaz
September 11,
Literary Hub,
11 Sep. 2025
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The Kremlin has succeeded in building a fortress economy, but one that is fortified against the future more than against the enemy.—
Jeremy Shapiro,
The Atlantic,
10 Sep. 2025
Noun
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And possibly sharks and God and the pledge of allegiance too.—
Literary Hub,
Literary Hub,
9 Sep. 2025
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But Harbaugh and the Wolverines did not waver in their commitment, and the result of their allegiance will live on forever.—
Alec Lewis,
New York Times,
8 Sep. 2025
Noun
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Philly diasporicans certainly are a proud local bastion of Latin identity, and the parade is an outpouring of civic love via flags, music, dance and food.—
Héctor M. Varela Rios,
The Conversation,
8 Sep. 2025
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Hundreds of thousands of people aimed to reach Germany, a bastion of economic stability and prosperity.—
Sebastian Shukla,
CNN Money,
5 Sep. 2025
Noun
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The promise of career gains through extreme dedication is often misleading, while the personal costs are undeniable.—
Caroline Castrillon,
Forbes.com,
15 Sep. 2025
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Advertisement This granular knowledge and deep curiosity is also what drives Speer’s long-standing dedication to protecting the vast, vulnerable open ocean and deep-sea environments that lie outside of national borders and hold some of the largest reservoirs of biodiversity on earth.—
Bonnie Tsui,
Time,
15 Sep. 2025
Cite this Entry
“Fastness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/fastness. Accessed 19 Sep. 2025.
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