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Adjective: ungrateful  ,ún'greyt-ful
  1. Not feeling or showing gratitude
    "ungrateful heirs";
    - thankless, unthankful
     
  2. Disagreeable
    "I will not perform the ungrateful task of comparing cases of failure"

See also: unappreciative, unpleasant

Antonym: grateful

Encyclopedia: Ungrateful