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Fastness

ˈfɑːs(t)nəs

Fastness definitions

noun

Inflections:

fastness fastnesses

a secure place well protected by natural features

"a remote Himalayan mountain fastness"

Synonyms:
firmness solidity steadiness secureness strength fastness stoutness sturdiness security safety
the ability of a material or dye to maintain its colour without fading or washing away

"the dyes differ in their fastness to light"

Synonyms:
rapidity swiftness speediness alacrity quickness fastness celerity velocity dispatch promptness immediacy expeditiousness expedition briskness sharpness