Definitions for unthankful
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Random House Webster's College Dictionary
un•thank′ful(adj.)
Princeton's WordNet
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
Wiktionary
unthankful(Adjective)
Not thankful; ungrateful.
Citation
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"unthankful." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/unthankful>.