- nounfastness (noun) · fastnesses (plural noun)
- a secure refuge, especially a place well protected by natural features:"a remote Himalayan mountain fastness"
- the ability of a material or dye to maintain its color without fading or washing away:"the dyes differ in their fastness to light"
OriginOld English fæstnes(see fast, -ness).Similar and Opposite Wordsnoun- a secure refuge, especially a place well protected by natural features:
- the ability of a material or dye to maintain its color without fading or washing away:
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