Princeton's WordNet

1. ungrateful, thankless, unthankful(adj)

   not feeling or showing gratitude

   "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare

2. ungrateful(adj)

   disagreeable

   "I will not perform the ungrateful task of comparing cases of failure"- Abraham Lincoln

Kernerman English Learner's Dictionary

1. ungrateful(adjective)ʌnˈgreɪt fəl

   not appreciating what sb has given or done for you

   Her father called her "an ungrateful child."; "Do I have to accept it?" she said ungratefully.

Wiktionary

1. ungrateful(Adjective)

   not grateful; not expressing gratitude; a dissatisfied person.

Webster Dictionary

1. Ungrateful(adj)

   not grateful; not thankful for favors; making no returns, or making ill return for kindness, attention, etc.; ingrateful

2. Ungrateful(adj)

   unpleasing; unacceptable; disagreeable; as, harsh sounds are ungrateful to the ear

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