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fastness

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1 a high rate of movement or performance

  • the amazing fastness with which the boy took his shower had us wondering if heʼd used any water
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2 a structure or place from which one can resist attack

  • the guerillas retreated to their network of hidden fastnesses deep within the mountains
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3 adherence to something to which one is bound by a pledge or duty

  • his uncompromising fastness to the cause of freedom was beyond question
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