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ungrateful

[uhn-greyt-fuh l] /ʌnˈgreɪt fəl/
adjective
1.
unappreciative; not displaying gratitude; not giving due return or recompense for benefits conferred:
ungrateful heirs.
2.
unpleasant; distasteful; repellent:
an ungrateful task.
Origin
1545-1555
1545-55; un-1 + grateful
Related forms
ungratefully, adverb
ungratefulness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un grateful

ungrateful

/ʌnˈɡreɪtfʊl/
adjective
1.
not grateful or thankful
2.
unrewarding or unpleasant; thankless
3.
(of land) failing to increase fertility in response to cultivation
Derived Forms
ungratefully, adverb
ungratefulness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un grateful

ungrateful

adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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