ungrateful

Adjective
  1. Not feeling or showing gratitude (synset 301150547)
    "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"
    similar to: unappreciative - not feeling or expressing gratitude
    same as: thankless, unthankful
  2. Disagreeable (synset 301810040)
    "I will not perform the ungrateful task of comparing cases of failure"
    similar to: unpleasant - offensive or disagreeable; causing discomfort or unhappiness

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