Etymology
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ungrateful (adj.)

1550s, from un- (1) "not" + grateful. Related: Ungratefully.

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Definitions of ungrateful

ungrateful (adj.)
not feeling or showing gratitude; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare;
ungrateful heirs
Synonyms: thankless / unthankful
ungrateful (adj.)
disagreeable; "I will not perform the ungrateful task of comparing cases of failure"- Abraham Lincoln;
From wordnet.princeton.edu