noun
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the quality of being hard, rough or coarse; harshness; roughness.
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the quality or fact of being unpleasantly crude, offensive to the mind or feelings of excessively severe; crudeness; severity.
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the quality or state of being void of pity; cruelness.
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the quality of being not easy to understand, perform or deal with; the condition or fact of being difficult; difficulty.
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the power of, and resistance to hardships in life.
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(min./geol.) power of, and resistance to scratching; hardness.