fastness
/ˈfæstnəs/
noun
- A secure or fortified place; a stronghold.
- The castle was a fastness that had never been conquered.
- The rebels retreated to their mountain fastness.
- The ancient fastness stood guard over the valley for centuries.
- The quality of being fast, quick, or speedy.
- The fastness of her reflexes saved her from the falling branch.
- He was amazed by the fastness of the new computer processor.
- The fastness of the cheetah is legendary.
- The quality of being firmly fixed or secure; stability or resistance to change (e.g., colorfastness).
- The fastness of the glue ensured the shelf stayed attached to the wall.
- The dye's fastness to sunlight made it ideal for outdoor fabrics.
- Test the color fastness of the shirt before washing it with whites.
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