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Adjective: thankless  thangk-lus
  1. Not feeling or showing gratitude
    "How sharper than a serpent's tooth it is / To have a thankless child!";
    - ungrateful, unthankful
     
  2. Not likely to be rewarded
    "grading papers is a thankless task";
    - unappreciated, ungratifying

See also: unappreciative, unrewarding

Nearest

thanatopsis
Thanatos
thane
thaneship
thank
thank offering
thank you
thankful
thankfully
thankfulness
thankless
thankless wretch
thanks
thanks a lot
thanks a million
Thanksgiving
thanksgiving
Thanksgiving cactus
Thanksgiving Day
thar
Thar Desert