unthankful

[uhn-thangk-fuhl]
adjective
1.
not thankful; ungrateful.
2.
not repaid with thanks; thankless: an unthankful task.

Origin:
1350–1400; Middle English; see un-1, thankful

unthankfully, adverb
unthankfulness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
unthankful

adjective
not feeling or showing gratitude; "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare [syn: ungrateful] [ant: grateful
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
It is an unthankful act on our part that the equine existence is taken for granted and that their needs are overlooked.
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