(comparative more ingrateful, superlative most ingrateful)
From ingrate (“unfriendly”) + -ful, from Latin ingrātus (“disagreeable”), from in- (“not”) + grātus (“pleasing”).
"ingrateful." YourDictionary, n.d. Web. 21 June 2018. <http://www.yourdictionary.com/ingrateful>.
ingrateful. (n.d.). Retrieved June 21st, 2018, from http://www.yourdictionary.com/ingrateful
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