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  1. Dictionary

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    fast·ness
    [ˈfastnəs]
    noun
    fastness (noun) · fastnesses (plural noun)
    1. a secure refuge, especially a place well protected by natural features:
      "a remote Himalayan mountain fastness"
    2. the ability of a material or dye to maintain its color without fading or washing away:
      "the dyes differ in their fastness to light"
    Origin
    Old English fæstnes(see fast, -ness).
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  2. Merriam Webster
    https://www.merriam-webster.com/dictionary/fastness

    Fastness Definition & Meaning - Merriam-Webster

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    4 Synonyms & Antonyms for FASTNESS | Thesaurus.com
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  3. Merriam Webster
    https://www.merriam-webster.com/thesaurus/fastness

    FASTNESS Synonyms: 108 Similar and Opposite Words - Merriam …

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    Fastness synonyms - 479 Words and Phrases for …
    powerthesaurus.org
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  4. Dictionary
    https://www.dictionary.com/browse/fastness

    FASTNESS Definition & Meaning | Dictionary.com

  5. The Free Dictionary
    https://www.thefreedictionary.com/fastness

    Fastness - definition of fastness by The Free Dictionary

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    Fastness Definition
    Firmness
  6. Cambridge Dictionary
    https://dictionary.cambridge.org/us/dictionary/english/fastness

    FASTNESS | definition in the Cambridge English Dictionary

  7. Images of Fastness

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    intouch-quality.com
    5 Color Fastness Tests to Prevent Textile Fading and Staining
    publications.americanalpineclub.org
    AAC Publications - Fastness Peak, East Face, Solo Winter Ascent by New ...
    intouch-quality.com
    5 Color Fastness Tests to Prevent Textile Fading and Staining
    testextextile.com
    IULTCS Rubbing Fastness Tester, Rubbing Fastness Tester - TESTEX
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    IULTCS Rubbing Fastness Tester, Rubbing Fastness Tester - TESTEX
    researchgate.net
    Color fastness to perspiration acid and alkali grey scale rating and ...
    artstation.com
    ArtStation - mountain fastness
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  8. Cambridge Dictionary
    https://dictionary.cambridge.org/dictionary/english/fastness

    FASTNESS | English meaning - Cambridge Dictionary

  9. Oxford Learner's Dictionaries
    https://www.oxfordlearnersdictionaries.com/definition/english/fastness

    fastness noun - Definition, pictures, pronunciation and usage …

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    Fastness Etymology
    Fast Noun Definition
  10. Longman Dictionary of Contemporary English Online
    https://www.ldoceonline.com/dictionary/fastness

    fastness | meaning of fastness in Longman Dictionary of …

  11. Wiktionary
    https://en.wiktionary.org/wiki/fastness

    fastness - Wiktionary, the free dictionary

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    Firmness
  12. Dictionary
    https://www.dictionary.com/browse/fastnesses

    Fastness Definition & Meaning | Dictionary.com

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    Fastness Definition
    Mountain Fastness