Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps


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