F f


    • US Pronunciation
    • US IPA
    • UK Pronunciation
    • UK IPA
    • [fast-nis, fahst-]
    • /ˈfæst nɪs, ˈfɑst-/
    • /ˈfɑːst.nəs/
    • US Pronunciation
    • US IPA
    • [fast-nis, fahst-]
    • /ˈfæst nɪs, ˈfɑst-/

Definitions of fastness word

  • noun fastness a secure or fortified place; stronghold: a mountain fastness. 1
  • noun fastness the state of being fixed or firm: the fastness of democratic institutions. 1
  • noun fastness the state of being rapid. 1
  • noun fastness A secure refuge, especially a place well protected by natural features. 1
  • countable noun fastness A fastness is a place, such as a castle, which is considered safe because it is difficult to reach or easy to defend against attack. 0
  • noun fastness a stronghold; fortress 0

Information block about the term

Origin of fastness

First appearance:

before 900
One of the 4% oldest English words
before 900; Middle English; Old English fæstnes. See fast1, -ness

Historical Comparancy

Parts of speech for Fastness


fastness popularity

A common word. It’s meaning is known to most children of preschool age. About 79% of English native speakers know the meaning and use the word.
According to our data about 58% of words is more used. This is a rare but used term. It occurs in the pages of specialized literature and in the speech of educated people.

fastness usage trend in Literature

This diagram is provided by Google Ngram Viewer

Synonyms for fastness

noun fastness

  • haste — swiftness of motion; speed; celerity: He performed his task with great haste. They felt the need for haste.
  • speed — rapidity in moving, going, traveling, proceeding, or performing; swiftness; celerity: the speed of light; the speed of sound.
  • rapidity — a rapid state or quality; quickness; celerity.
  • stronghold — a well-fortified place; fortress.
  • fortress — a large fortified place; a fort or group of forts, often including a town; citadel.

Antonyms for fastness

noun fastness

  • slowness — moving or proceeding with little or less than usual speed or velocity: a slow train.

Top questions with fastness

  • what does color fastness mean?
  • what is color fastness?

See also

Matching words

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