thankless

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• February 9. 2013 from wordnet.princeton.edu

  thankless — adjective — english

  not feeling or showing gratitude; "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare

• March 31. 2016 from wordnet.princeton.edu

  thankless — adjective — english

  not likely to be rewarded; "grading papers is a thankless task"