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Noun: fastness  făst-nus
  1. A rate (usually rapid) at which something happens
    "the project advanced with gratifying fastness"
    - speed, swiftness
     
  2. The quality of being fixed in place as by some firm attachment
    - fixedness, fixity, fixture, secureness
     
  3. A strongly fortified defensive structure
    - stronghold

Derived forms: fastnesses

See also: fast, slow

Type of: defence [Brit, Cdn], defense [US], defensive structure, immovability, immovableness, pace, rate

Nearest

fast-flying
fast-footed
fast-growing
fastidious
fastidiously
fastidiousness
fastigiate
fasting
fastly
fastnacht
fastness
fast-paced
fast-talk
fastuous
fat
fat cat
fat cell
fat chance
fat embolism
fat farm
fat hen