What is the meaning of Hard?

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APAWebster's. (2011). hard. Retrieved October 20, 2018, from http://smartdefine.org/hard/definitions/2015012
ChicagoWebster's. 2011. "hard" http://smartdefine.org/hard/definitions/2015012 (accessed October 20, 2018).
HarvardWebster's 2011, hard, Smart Define, viewed 20 October, 2018, <http://smartdefine.org/hard/definitions/2015012>.
MLAWebster's. "hard" 27 May 2011. Web. 20 October 2018. <http://smartdefine.org/hard/definitions/2015012>
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