The Collaborative International Dictionary of English v.0.48:

Ingratitude \In*grat"i*tude\, n. [F. ingratitude, L.
   ingratitudo. See Ingrate.]
   Lack of gratitude; insensibility to, forgetfulness of, or ill
   return for, kindness or favors received; unthankfulness;
   ungratefulness.
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         Ingratitude, thou marble-hearted fiend.  --Shak.
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         Ingratitude is abhorred both by God and man.
                                                  --L'Estrange.
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