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Definitions of thankless
  1. adjective
    not feeling or showing gratitude
    "How sharper than a serpent's tooth it is / To have a thankless child!"
  2. adjective
    not likely to be rewarded
    "grading papers is a thankless task"
Examples of thankless
  • "How sharper than a serpent's tooth it is / To have a thankless child!"
  • "grading papers is a thankless task"
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