industrious; zealous: a hardworking family man.

1765–75; hard + working

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
But he is hardworking, and a skilled parliamentary tactician.
So others may feel unequal and they may feel upset so no matter how hardworking
  they are, they will never get what they deserve.
These are hardworking public servants who are doing the best they can.
Hardworking muscles release lactic acid, which causes soreness.
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