noun
the quality of being sharp or having a sharp edge
adjective
having a thin edge or point that can cut or pierce easily
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The sharpness of the knife made it easy to slice through the tough meat.
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Be careful with that knife, it has a lot of sharpness to it.
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Dang, that blade's got some serious sharpness!
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His wit and sharpness of mind always kept the conversation lively.