ungrateful

From un- +‎ grateful.

• IPA^(key): /ʌnˈɡɹeɪtfəl/

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ungrateful (comparative more ungrateful, superlative most ungrateful)

1. Not grateful; not expressing gratitude.

   Antonym: grateful

   Near-synonyms: unappreciative, unthankful

   • 1913 June–December, Edgar Rice Burroughs, “A Duel”, in The Return of Tarzan, New York, N.Y.: A[lbert] L[evi] Burt Company, […], published March 1915, →OCLC, pages 84–85:

     “It seems to delight you to think that you are to leave Paris, and that we shall not see each other for months, perhaps. Tarzan, you are a most ungrateful beast!” and D’Arnot laughed.

2. Disagreeable, repellent, unpleasant.
   • 1850, [Alfred, Lord Tennyson], “Canto XXXVIII”, in In Memoriam, London: Edward Moxon, […], →OCLC, page 59:

     If any care for what is here
     ⁠Survive in spirits render’d free,
     ⁠Then are these songs I sing of thee
     Not all ungrateful to thine ear.

ungrateful (plural ungratefuls)

1. A person who fails to show gratitude; an ingrate.