ingratitude

[ in-grat-i-tood, -tyood ]
/ ɪnˈgræt ɪˌtud, -ˌtyud /

noun

the state of being ungrateful; unthankfulness.

Origin of ingratitude

First recorded in 1175–1225; Middle English word from Medieval Latin word ingrātitūdō. See in-3, gratitude
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British Dictionary definitions for ingratitude

ingratitude
/ (ɪnˈɡrætɪˌtjuːd) /

noun

lack of gratitude; ungratefulness; thanklessness
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