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hard1: not easily penetrated : not easily yielding to pressure2 aof liquor : strongly alcoholic; specifically : having an alcoholic content of more than 22.5 percent b: characterized by the presence of salts (as of calcium or magnesium) that prevent lathering with soap <hard water>3: of or relating to radiation of relatively high penetrating power <hard X-rays>4 a: physically fit <in good hard condition> b: resistant to stress (as disease)5: being at once addictive and gravely detrimental to health <such hard drugs as heroin>6: resistant to biodegradation <hard detergents> <hard pesticides like DDT>
— hard·ness noun
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