fastness: meaning, definition, pronunciation and examples
C1/C2 (Low-frequency, literary/technical)Formal, Literary, Technical (e.g., textiles, mountaineering, archaic military)
Quick answer
What does “fastness” mean?
The quality or condition of being fixed, firm, or not easily moved.
Audio
Pronunciation
Definition
Meaning and Definition
The quality or condition of being fixed, firm, or not easily moved; a secure, fortified place.
The quality of being resistant to fading or colour change; steadfastness, constancy. Also refers to a remote stronghold or fortress.
Dialectal Variation
British vs American Usage
Differences
In BrE, 'fastness' is slightly more common in historical/geographical contexts (e.g., mountain fastness). In AmE, its primary technical use is in textiles ('colour fastness'). Both are very low frequency.
Connotations
BrE: archaic, romantic, descriptive of landscape. AmE: technical, industrial. Both share the literary connotation of an isolated retreat.
Frequency
Extremely low in general conversation. Higher frequency in specific domains: fabric manufacturing, fantasy literature, historical writing.
Grammar
How to Use “fastness” in a Sentence
the fastness of [something] (e.g., the fastness of the dye)seek refuge in a [descriptor] fastness (e.g., a mountain fastness)Vocabulary
Collocations
Examples
Examples of “fastness” in a Sentence
verb
British English
- Not applicable. 'Fastness' is a noun only.
American English
- Not applicable. 'Fastness' is a noun only.
adverb
British English
- Not applicable. 'Fastness' is a noun only.
American English
- Not applicable. 'Fastness' is a noun only.
adjective
British English
- Not applicable. 'Fastness' is a noun only.
American English
- Not applicable. 'Fastness' is a noun only.
Usage
Meaning in Context
Business
Rare, except possibly in textile or dye manufacturing: 'The fabric's colour fastness meets industry standards.'
Academic
Used in historical/geographical texts: 'The rebels retreated to their mountain fastness.'
Everyday
Virtually never used in everyday conversation.
Technical
Common in textiles: 'light fastness', 'wash fastness'; also in mountaineering for a secure climbing position.
Vocabulary
Synonyms of “fastness”
Vocabulary
Antonyms of “fastness”
Watch out
Common Mistakes When Using “fastness”
- Using it to mean 'speed' (e.g., 'the fastness of the car').
- Using it in casual contexts where 'strength', 'security', or 'fortress' would be more natural.
- Pronouncing it with a short 'a' in BrE (should be long /ɑː/).
FAQ
Frequently Asked Questions
No. It derives from the Old English 'fæst' meaning 'firm, fixed, secure', not the modern meaning of 'quick'. They are etymological homographs.
It would sound very formal or archaic. In most contexts, use 'fortress', 'stronghold', or 'colour-fast quality' instead.
It is a technical term from textiles meaning the resistance of a dye or colour to fading or running when exposed to light, washing, or other agents.
No, it is a low-frequency, specialised word. You will encounter it primarily in technical manuals (textiles), historical writing, or fantasy literature.
The quality or condition of being fixed, firm, or not easily moved.
Fastness is usually formal, literary, technical (e.g., textiles, mountaineering, archaic military) in register.
Fastness: in British English it is pronounced /ˈfɑːs(t)nəs/, and in American English it is pronounced /ˈfæs(t)nəs/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None. 'Fastness' is not used in common idioms.”
Learning
Memory Aids
Mnemonic
Think of a FAST (firm) NESS (place or state) – a firm place like a fortress, or the firm state of a colour that won't run.
Conceptual Metaphor
STEADFASTNESS IS BEING FIRMLY ANCHORED / SECURITY IS A FORTRESS.
Practice
Quiz
In which context is 'fastness' most commonly used today?