noun

fastness

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Fastness (noun) means How fast something is, in whichever sense the word is used.

noun

How fast something is, in whichever sense the word is used.

The state of being firmly fixed or securely attached.

"Although aniline dyes have replaced most natural dyes in the modern era, natural dyers still revere cochineal for its brilliance and fastness." — Sara Temme, Two Insects nad Their Brilliant Reds (2026)

How well a dye keeps its colour without fading.

The quality of moving or happening very quickly.

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C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

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Etymology

From Middle English fastnes, fastnesse (“immovableness, stability; firmness, solidness; secure attachment; constancy; obstinacy; something giving firmness or strength; of sleep: soundness; of a wound: healing; assurance, confirmation”) [and other forms], from Old English fæstnes (“fastness, firmness, stability; resolution; tenacity; vigour; firmament; fortification”) [and other forms], from fæst (“firm, stable; constant”) (from Proto-Germanic *fastuz (“firm, fixed; secure”); see further at that entry) + -nes (suffix forming abstract nouns denoting a quality or state). The English word may be analysed as fast + -ness.

Synonyms

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swiftness fixedness stronghold fixity secureness fixture speed

Related words

rate match race speed regular upper fix danger

Rhymes for fastness

vastness

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Frequently asked questions

What is the meaning of fastness?

"fastness" (noun) means how fast something is, in whichever sense the word is used.

What is another word for fastness?

Other words for "fastness" include swiftness, fixedness, stronghold, fixity, secureness, fixture.

What are the different meanings of fastness?

"fastness" has 3 main meanings: 1. How fast something is, in whichever sense the word is used; 2. The state of being firmly fixed or securely attached; 3. How well a dye keeps its colour without fading.

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rate match race speed regular upper fix danger